GREISINGER GMK 210 User manual

H68.0.02.6C-04
GREISINGER electronic GmbH
D - 93128 Regenstauf, Hans-Sachs-Straße 26
Tel.: 09402 / 9383-0, Fax: 09402 / 9383-33, eMail: [e-mail]
as of version 1.0
GMK 210
Operation Manual
Material moisture meter for non-destructive measurements
Application: camper, caravan and boat
WEEE-Reg.-Nr. DE 93889386
JSP, s.r.o., Raisova 547, 506 01 Jičín, Czech Republic
Phone: [phone], Fax: [phone], e-mail: [email protected] www.jsp.cz
JSP Industrial Controls

H68.0.02.6C-04 Operating Manual GMK 210 page 2 of 20
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Index
1INTENDED USE..........................................................................................................................................3
2GENERAL NOTE .......................................................................................................................................3
2.1 SAFETY SIGNS AND SYMBOLS...................................................................................................................3
2.2 SAFETY GUIDELINES.................................................................................................................................4
3PRODUCT DESCRIPTION.......................................................................................................................4
3.1 SCOPE OF SUPPLY.....................................................................................................................................4
3.2 OPERATION AND MAINTENANCE ADVICE..................................................................................................4
4HANDLING .................................................................................................................................................5
4.1 DISPLAY ELEMENTS .................................................................................................................................5
4.2 CONTROL ELEMENTS................................................................................................................................5
4.3 MEASURING SPOT:REAR SIDE ..................................................................................................................5
4.4 START OF OPERATION...............................................................................................................................5
5MEASUREMENT BASICS........................................................................................................................6
5.1 MEASURING FIELD &DEPTH.....................................................................................................................6
5.2 HUMIDITY RATING (‘WET’ -‘MEDIUM’ -‘DRY’) .............................................................................6
5.3 HOLDING THE DEVICE ..............................................................................................................................7
5.4 MOISTURE U AND WATER CONTENT W......................................................................................................7
5.5 CHARACTERISTICS AND MATERIALS.........................................................................................................8
5.6 ZEROING FUNCTION..................................................................................................................................8
6OPERATING-MODES „MEASURING MODE“ AND „DETECTOR MODE“ ................................9
6.1 MEASURING MODE ..................................................................................................................................9
6.2 DETECTOR MODE.....................................................................................................................................9
7WOOD MEASURING ..............................................................................................................................10
8MEASUREMENT OF OTHER MATERIALS......................................................................................10
9RATING OF MOTOR HOMES AND CARAVANS .............................................................................11
9.1 MATERIALS AND DESIGN........................................................................................................................11
9.2 DEFINING MEASURING POINTS FOR CONTINUOUS INSPECTION ................................................................11
9.3 MEASURING INTERVALS /TIMES.............................................................................................................13
9.4 REPAIR...................................................................................................................................................13
10 RATING OF GRP BOAT HULLS.......................................................................................................14
10.1 DESIGN PRINCIPLE OF GRP HULLS......................................................................................................14
10.2 PROCEDURE ........................................................................................................................................14
11 CONFIGURATION OF THE DEVICE...............................................................................................16
12 ADJUSTMENT.......................................................................................................................................17
13 ACCURACY INSPECTION: ADJUSTMENT /UPDATE SERVICE..............................................17
14 ERROR AND SYSTEM MESSAGES.................................................................................................17
15 SPECIFICATIONS................................................................................................................................18
16 DISPOSAL NOTES................................................................................................................................18
ADDENDUM A: WOOD TYPES TABLE ....................................................................................................19

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1 Intended Use
The device is designed for measurements of moisture (%u) and water content (%w) of materials
with flat surface and a thickness of at least 10mm.
In addition, it is possible to find moist spots very quickly and comfortably 
, the display value here is relative [digit].
The measurement takes place at an insulated measuring spot at the rear side of the device.
The GMK 110 is particularly suited for moisture measurements in the following materials:
wood
GRP
The GMK 110 is especially designed to meet the needs of moisture ratings of boats, camper vans
and caravans.
For use at construction site we recommend the GMK 100 (wood, floor screed and plaster
characteristics, CM-humidity)
The safety requirements (see below) have to be observed.
The device must be used only according to its intended purpose and under suitable conditions.
Use the device carefully and according to its technical data (do not throw 
Protect the device from dirt.
2 General Note
Read this document carefully and get used to the operation of the device before you use it. Keep
this document within easy reach near the device for consulting in case of doubt.
2.1 Safety signs and symbols
Warnings are labeled in this document with the followings signs:
Caution! This symbol warns of imminent danger, death, serious
injuries and significant damage to property at non-observance.

Attention! This symbol warns of possible dangers or dangerous
situations which can provoke damage to the device or
environment at non-observance.
Note! This symbol point out processes which can indirectly
influence operation or provoke unforeseen reactions at non-
observance.

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2.2 Safety guidelines
This device has been designed and tested in accordance with the safety regulations for electronic
devices. However, its trouble-free operation and reliability cannot be guaranteed unless the
standard safety measures and special safety advises given in this manual will be adhered to when
using the device.
1. Trouble-free operation and reliability of the device can only be guaranteed if the device is not
subjected to any other climatic conditions than those stated under "Specification".
If the device is transported from a cold to a warm environment condensation may cause in a
failure of the function. In such a case make sure the device temperature has adjusted to the
ambient temperature before trying a new start-up.
2. If there is a risk whatsoever involved in running it, the device has to be switched off
immediately and to be marked accordingly to avoid re-starting.
Operator safety may be a risk if:
- there is visible damage to the device
- the device is not working as specified
- the device has been stored under unsuitable conditions for a longer time.
In case of doubt, please return device to manufacturer for repair or maintenance.
3. When connecting the device to other devices the connection has to be designed most
thoroughly as internal connections in third-party devices (e.g. connection GND with protective
earth) may lead to undesired voltage potentials that can lead to malfunctions or destroying of the
device and the connected devices.
This device must not be run with a defective or damages power supply unit.
Danger to life due to electrical shock!
4. Do not use these products as safety or emergency stop devices or in any other
application where failure of the product could result in personal injury or material
damage.
Failure to comply with these instructions could result in death or serious injury and
material damage.
5. This device must not be used at potentially explosive areas! The usage of this
device at potentially explosive areas increases danger of deflagration, explosion or
fire due to sparking.
3 Product Description
3.1 Scope of supply
The scope of supply includes:
GMK 210
9V - battery
Operating manual
Short manual
3.2 Operation and maintenance advice

However, the device will operate correctly for a certain time.
The battery has to be taken out, when storing device above 50°C.
We recommend taking out battery if device is not used for a longer period of time.

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4 Handling
4.1 Display elements
1: Main display
Display of the current moisture or water
content
2: Material display
The name of the selected material
characteristic curve is displayed
3: Moisture rating
Moisture rating via bar graph
4: HLD
-key)
4.2 Control elements
Key 1:
on/off key,
Press long: switch device off
Press shortly: activation of backlight
see chapter 11Li
Key 2:
sort up
Material selection: upwards, see chapter 5.5
Key 3:
hold:
-

press for 2sec.: Zeroing function (see chapter 5.6)
Key 2 and 3
together:
sort down
Material selection: downwards, see chapter 5.5
Depth switch:
(on the right side)
Sliding switch up: ca. 10 mm measuring depth (d 10)
Sliding switch down: ca. 25 mm measuring depth (d 25)

 
4.3 Measuring spot: rear side
Rear side of device:
The entire dark grey surface has to lie on the measured material
without any air gap.

under that it is predominantly measured.
4.4 Start of operation
Switch the device on with the key .
After segment test the device displays some information to its configuration:
S. 10 if there is a slope adjustment for the 10 mm measurement (see chapter 12)
S.25 if there is a slope adjustment for the 25 mm measurement (see chapter 12)
P.OF if the automatic-off-function is activated (see chapter 11)
The device is ready for measuring afterwards.

H68.0.02.6C-04 Operating Manual GMK 210 page 6 of 20
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5 Measurement Basics
5.1 Measuring field & depth
The device measures by means of an electric field (capacitive measuring method), which
propagates from the rear side downwards. The measuring depth can be changed between approx.
10 mm and 25 mm with the sliding switch.
Side view: measuring field and penetration depth for switch setting “10 mm”
Side view: measuring field and penetration depth for switch setting “25 mm”
The specifications for the penetration depth 10 mm and 25 mm are just approximate values. The
actual depth will be the higher the wetter the measured material is. Therefore areas deeper than
25 mm will be measured in very wet materials and for switch setting 25 mm.
On the rear side the area is marked under that it is predominantly measured.
For precise measurements the device has to lie on the measured material not only
at the marked measuring spot but at its whole rear side. If there is an air gap
between device and material the measured value will be too dry!
Some examples for measurements that are not precise. (Measured value too dry in all cases):
False: wrinkled surface (extreme
example!)
False: unsteady surface
False: material too thin
5.2 Humidity rating - -DRY)
In addition to the measuring value there is a moisture rating via bar graph and acoustic signal (if
activated (see chapter 11
most applications and has no longer be deduced from literature and tables.
However, this rating can only be a first approximate value, because factors like the
application field of the measured material have to be taken into account for the final
rating. This device cannot completely replace the knowledge of an experienced
craftsman or technical expert.
ATTENTION:

ATTENTION:


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5.3 Holding the device
The water content of the hand has an impact on the measuring value, if the device is
held inappropriately.
The best results will be obtained if you lay the device down or hold it the way as
shown in picture 3.
Picture 1: Held in a wrong way!
Picture 2: laid down –right!
Picture 3: Held in the right way!
5.4 Moisture u and water content w
Either moisture u or water content w is needed according to the application.
Carpenter, joiner, etc. normally use moisture u (relating to oven-dry mass)
Water content w is normally used for combustibles (i.e. wood briquette).
You can choose whether the device should use moisture or water content (see chapter 11).
Moisture u (relating to oven-dry mass) - recommended setting
The unit is %u (also common: % atro, weight percent).
mass wet: mass of the sample (= total mass = masswater + mass dry)
mass water: mass of the water contained in the sample
mass dry: mass of the oven-dried sample after (water has been evaporated)
Example: 1kg wet wood that contains 500g water has a moisture u of 100%.
Water content w (= moisture relating to wet total mass)
The unit is %w
Example: 1kg wet wood that contains 500g water has a water content of 50%.
ATTENTION:

moisture u[%] = ( (mass wet - mass dry ) / mass dry) *100
or: moisture u[%] = (mass water / mass dry) *100
water content [%] = ( (mass wet - mass dry) / mass wet) *100
or: water content [%] = (mass water / mass wet) *100

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5.5 Characteristics and materials
Characteristics
rEF
Reference characteristics
d.45
Wood, density = 450 kg/m3
d.50
Wood, density = 500 kg/m3
d.55
Wood, density = 550 kg/m3
d.60
Wood, density = 600 kg/m3
d.65
Wood, density = 650 kg/m3
d.70
Wood, density = 700 kg/m3
d.75
Wood, density = 750 kg/m3
d.80
Wood, density = 800 kg/m3
d.85
Wood, density = 850 kg/m3
d.90
Wood, density = 900 kg/m3
d.95
Wood, density = 950 kg/m3
d.99
Wood, density = 1000 kg/m3
GrP
GRP (glass-fibre reinforced plastic)
ISO
Light insulation materials, e.g. Styrofoam
You can find a list of different types of wood and their corresponding characteristics d.xx in the
addendum.
The materials are selected with these keys:
material selection upwards: press
Material selection downwards: press at the same time
The use of inappropriate characteristics can cause faulty measurements!
5.6 Zeroing function
It is recommended to run regularly the zeroing function for best measuring
results:

for 2 seconds.

characteristics. If the device shows at air a value <0.5 or >0.5 or blinking -
-
Please pay attention not to influence the zeroing function
with your hands.
The best way to ensure this is shown left.
NOTE: The zeroing function of the GMK 210 adjusts the zero-point for both 10 mm and 25 mm at
the same time.
ACHTUNG:

ATTENTION:


H68.0.02.6C-04 Operating Manual GMK 210 page 9 of 20
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6 Operating-Modes asuring ModeDetector Mode
The device has two operating modes:
1. Measurement (curves: dEt oF)
2. Detector (relative measurement with adjustable alarm threshold : dEt on)
The modes can be switched via the configuration menu.
6.1 Measuring Mode
In the measuring mode (Configuration: dEt oF) material can be measured precisely.
There are material curves available. The display is done in absolute unit (%u or %w). An
appropriate rating is shown as a bar graph or as an acoustic signal.
6.2 Detector Mode
In the detector mode (Configuration: dEt on, material selection is fixed:  = rEF curve) can be
searched very comfortably for moist spots with high resolution and adjustable alarm threshold 
, metal structures, beams in plasterboard, etc. The measurement is relative (only rEF-curve!
Display = no unit)
After the detector mode is enabled (Configuration: dEt on), a reasonable alarm threshold
(=sensitivity  should be chosen, examples:
- Search for structures under drywall: 10
- Search for trouble spots on the hull: 10
- Search for wood or metal studs in plasterboard 5
The alarm threshold determines at which display value maximum humidity is rated (over bar display
and beep)
Procedure:
Place the unit on a reference point (dry) and perform a zero calibration 
until 0.0 is displayed (~ 2 seconds).
Slowly scan the area -> if increased moisture is detected, the alarm signal and corresponding bar
graph will signal this additionally to the changing display value.
Additional warnings in the detector mode:
Depth switch setting of 10 mm: A measuring in the depth of ~25 mm is a much
more moist, than the value shown in display.
Depth switch setting of 25 mm: : A measuring in the depth of ~10 mm is a much
more moist, than the value shown in display.

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7 Wood Measuring
Choose material corresponding to your type of wood according to the table in addendum A.
Example: You want to measure Scots pine -> select material d.50

Unplanned and wrinkled surfaces cause too low measuring results!
NOTE: 
growth and flaws (knots, cracks, resin pockets, etc.). This may lead
to measuring errors up to several %u, because the measurement
depends on density.
If your kind of wood is not listed in addendum A, you have to know its density
(dry): for example a wood of density 0.68 kg/dm3 is measured with material d.70
(approximate actual density to the next material 0.52 ->d.50, 0.53 -> d.55)
8 Measurement of Other Materials
The device has not saved characteristics for all materials. But even if there is no characteristic
curve for your material you can do significant relative measurements.
-value, intentional no %u or %w display) for
this purpose.
For example if you want to evaluate water damage you can measure surely dry spot and an
evidently wet one (identifiable by salt efflorescence, water spots, mould growth, etc.). Then you can
compare the other measuring values with them and get the moisture distribution of your measuring
area or find the reason for the moisture penetration.
You do not need absolute values (%u or %w) for this.
NOTE: Please consider that the configuration of the measured wall (cavity block, cement
joints, reinforcements, etc.) may also influences the measuring values.

H68.0.02.6C-04 Operating Manual GMK 210 page 11 of 20
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9 Rating of Motor Homes and Caravans
Normal humidity should not cause serious problems at faultless and correctly used motor homes
and caravans.
However, the following problems can occur due to increased humidity:
- mildew together with its smell nuisance and health risks
- damage to materials (
The humidity can occur from different sources:
- from the outside: rain water or splash water gets into the structure through leaks in the

- from the inside: leaky installations and condensation water from humidity disposal of the
passengers, cooking, potted plants, ...
To maintain the value of the vehicle it is important to detect and remove increased humidity as soon
as possible.
The device can detect humidity in structures long before it is visible for human eyes (water

Exception: metal. If metal structures are very close to the sensor area the device displays too high
values in most cases. Therefore metallic rods, reinforcement, aluminum insulation blankets, metal
wires etc. can cause problems.
9.1 Materials and design
It is important to know the design of your motor vehicle/caravan for well-grounded ratings.
Depending on the actual design there may be different weak points and spots, most likely for water
entry from outside.
Following questions should be answered:
Where are critical points like connection between wall and roof, windows, doors and gates,
shower trays, sealings, gorges)
Are the damages from accidents /repaired areas
Is it a wooden framework construction? Especially common for older models.
Is the hull a sandwich construction? Made of what materials?
Where are metallic rods/reinforcements? Where are metal wires and pipes?
9.2 Defining measuring points for continuous inspection
We recommend to define some measuring points from begin on and check and record them
regularly (at least every ½ year). Humidity risks and impending damages can be recognized very
early then.
Defining the measuring points
The measuring points should be determined deliberately.
Especially weak points (edges/welds, windows, doors, etc.) should be monitored.
An overview of three possible weak points:
roof sealing, window sealing and assembly weld upper to lower trailer body
The reason here: old and porous window sealing

H68.0.02.6C-04 Operating Manual GMK 210 page 12 of 20
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Insulation and metal framing of an older caravan
Consider the properties of water:
- water normally flows downwards: water accumulations at the side walls have most
commonly their reason above the spot.
- water flows faster through gaps than through bulky materials, i.e. water can move along
rods, cables, etc. to accumulation spots
Absolute moisture (characteristic) and relative measurements
The device can display absolute material moisture if a suitable characteristic curve is selected and
the measured component is bulky enough (at least thicker than ~8mm). In this case the moisture
can be immediately rated (bar graph and buzzer).
Note: There are cases in which a precise absolute moisture measurements (in [%]) and the ratings
based on this measurements cannot be performed. However, a relative measurement may be still
possible: therefore the displayed measuring value is compared to an value measured at a definitely
dry spot of the same material. A displayed value considerably higher than that reference value
indicates a corresponding measuring point with most likely increased humidity.
Measuring at bulky components ( parts of the wooden framework, etc.)
. Measuring depth 10 or 25mm, depends on thickness
Caravan floor: massive flake board, little protected
-construction
GRP--
characteristic.
Select measuring depth 10mm to rate the material and 25mm to detect moisture behind the layer.
Measuring at insulations
Older models are often isolated with
simple polystyrene -> measurable water
accumulations can occur.
Attention! Here relative values are more
relevant, because for insulation materials
only very small display values are
measured.
Suggested setting, if it is measured
directly on insulation, 25 mm.

H68.0.02.6C-04 Operating Manual GMK 210 page 13 of 20
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Example sandwich: aluminum - insulation - plywood
Sandwich
Up-to-date sandwich constructions use mainly
high--insulation materials.
This reduces moisture problems in plane
areas, in open pore foams, there can be
significant amounts of water.
Suggested settings for sandwich like picture:
- d.45, 25 mm for evaluation of Insulation
(- d.60, 10 mm for evaluation of plywood)
Please keep in mind: metal constructions
below plywood can show extremely to high
display values, wooden frames also may show
to high values, but with suggestetd setting
above, no moisture warning will result.
Alternatively the detector mode can be
recommended instead of measuring mode:
please refer to 6 Operating-Modes „Measuring Mode“ and „Detector Mode“
9.3 Measuring intervals / times
Inspections by the specialist retailer at regular intervals (annually) are common for new
caravans/motor vehicles to preserve leak tightness warranty. This is reasonable, but with costs!
Defects can lead to massive humidity damage within only little time. For example mildew can form
within few month.
Therefore responsible measuring times are for example:
- immediately after long usage (e.g. together with final cleaning)
- at longer standing phases, especially at not-roofed areas: every 3 month
- immediately after frost season
- during usage: regularly
9.4 Repair
If there is a spot with critically moisture then:
- rectify the cause: (replace sealing / supply sealing material 
This have to be done professionally and with adequate materials and tools.
The repairs should be done at a qualified garage or ask for the advice from an expert.
- dehumidify
e.g. with standard air dehumidifier or with alternating heating and venting
Please consider (heating): preferable use electric heating but no simple gas heaters. Gas
heaters produce humidity and there is the danger of suffocation!
Close doors and windows (or only slightly opened) during heating.
Please consider (venting): Open doors and windows as wide as possible for rapid air
exchange
- monitoring
Check the corresponding parts/spots for a longer period (record values!) to make sure that
ALL causes are rectified and the repair has been successful.

H68.0.02.6C-04 Operating Manual GMK 210 page 14 of 20
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
10 Rating of GRP boat hulls
10.1 Design principle of GRP hulls
The load-bearing material of GRP boats is Glass-fiber
Reinforced Plastic. This plastic is extremely robust,
but water can entry to the laminate structure due to
osmotic and capillary effects and damage it
permanently: The material gets deformed and
unstable.
A gel coat layer protects the GRP laminate from water
entering.
Antifouling: Paint coat protecting against growth of
algae/bivalves etc.
If water has entered the GRP structure it can be measures very easily nondestructively measured
with the GMK 110 without any further tools.
The device detects water inside the GRP structure by means of a capacitive measuring principle.
Water has a relatively high permittivity. Examples for different permittivity values:
Vacuum/air 1
Polyester- and Epoxy resin ~ 3...4
Glass-fiber ~6...7
Water ~80
ATTENTION: Structures containing carbon fibers or structures with metallic/graphitic coatings.
Metallic elements will also cause increased display values.
10.2 Procedure
Recommended settings:
- Measuring mode, .
- %u, measuring depth 25mm ( refer to chapter 6.2)
NOTE: Sometimes a wood characteristic (e.g. d.50) is used. Although this is not generally
senseless, you have to keep in mind that in this case the displayed values (in %) can
only serve as comparative values but not as absolute values.
The electric properties used by the device for measurement are different for wood and
GRP! Remember this problematic especially if you want to compare values of different
devices!
The surface of the hull must me dry for
measurement. Humidity on surface will cause
unrealistic high display values!
Additionally wait at least 2 days after the boat has
lifted out of water before starting a measurement:
the antifouling can contain a large amount of water
without causing any damage, but the measurement
would be falsified.
boat hull
GRP
Outside

H68.0.02.6C-04 Operating Manual GMK 210 page 15 of 20
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It is reasonable to assume the hull above waterline containing almost no water. Thus perform a
reference measurement above waterline. Values below 2% should be expected.
Below waterline the values will be higher, especially if the boat has been in water for a long time.
This must not mandatory be problematic. However, if the measuring value exceeds 3% there
should be further investigations.
Areas with pimples or water accumulations not seen from the outside cause considerable higher
measuring values.
It is important that the boat hull is well dried-up before a new antifouling is attached or if the boat
gets reconstructed.
The following procedure may be helpfully to monitor the dry-up of the hull:
Search for crucial measuring spots (visible damages, keel/rudder connections, other areas with
increased measuring values) and mark them with water-proof marker.
Record the values at that measuring spots.

H68.0.02.6C-04 Operating Manual GMK 210 page 16 of 20
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11 Configuration of the device
Follow these instructions to configure the functions of the device:
Switch the device off.
Press and keep it pressed, while turning the device on (press shortly).
Release the sort-P.OF
Set parameter with up or down .
Jump to the next parameter by pressing .
Parameter
Value
Information
button
buttons
.
Detector Modefactory setting: oF
OF
Device measures absolute humidity parameters (%) material curves are
available
ON
Device operates as a detector (relative measurement only) with adjustable
sensitivity
.
/
.
Detector Mode: Sensitivity factory setting: 10
5 100
Sensitivity of the bar graph and acoustic signal
Set value corresponds to maximum rating via bar / acoustic signal
.
Auto Power-Off (turn-off delay) factory setting: 20 min
1 120
Auto Power-Off (turn-off delay) in minutes. If no key is pressed for the time

OF
Auto power-off is deactivated (continuous operation)
.
Display unit factory setting: %u
%u
Measuring value displayed in moisture %u
%w
Measuring value displayed in water content %w
.
Backlight factory setting: 5
OF
No backlight
5 120

ON
Backlight always on as long as device is switched on
.
Acoustic signal factory setting: on
OF
No acoustic signal
ON
Acoustic signal for moisture rating
.
Auto Hold factory setting: oF
OF
Auto Hold deactivated: pressing hold-key freezes measuring and releases it
again
ON
Auto Hold activated: hold-
as soon as a stable measuring value was detected.
.
Restore factory settings
NO
Parameters are not changed to factory settings.
Go
ATTENTION: All parameters are changed to factory settings.
Press again to store changed settings, the device restarts (segment test).
NOTE: If there is no key pressed within the menu mode within 2 minutes, the configuration will be
cancelled, the entered settings are lost!

H68.0.02.6C-04 Operating Manual GMK 210 page 17 of 20
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12 Adjustment
The accuracy can be checked with the testing probe PW 25 (optional accessories).
nd run the zeroing function (see chapter 5.6).
Lay the device onto the testing cube. If the device displays a different value than the value printed
on the cube for the device, you can use the slope correction to adjust the device:
Displayed value rEF =(measured value rEF * (1 + slope correction / 100 )
Follow these instructions to adjust the device:
Switch the device off.
Press and keep it pressed, while turning the device on (press shortly).
Release the hold-S. 10splayed.
Set parameter with up or down .
Jump to the next parameter by pressing .
Parameter
Value
Information
button
buttons
Slope correction for measuring depth 10 mm factory setting: of= 0%
OF
-
Value of slope correction in %
Slope correction for measuring depth 25 mm factory setting: of= 0%
OF
-
Value of slope correction in %
Press again to store changed settings, the device restarts (segment test).
NOTE: If there is no key pressed within the menu mode within 2 minutes, the configuration will
be cancelled, the entered settings are lost!
13 Accuracy Inspection: Adjustment /Update Service
You can send the device to the manufacture or retailer for adjustment and inspection.
Moreover the manufacturer can do the latest software update. This ensures that future
improvements are provided to owners of older devices in a cost-saving way. You can display the
current software version if you do not release the on/off button after you switched the device on, but

14 Error and System Messages
ER. 1
Value exceeding measuring range, value too high
Value below display range, (value < 19)
ER. 7
System error the device has detected a system error (device defective or not within
working temperature)
The blinking bAt display indicates low battery voltage, device will continue to work for a
short time.
The battery is consumed and has to be changed. Measurements are no longer
possible.

H68.0.02.6C-04 Operating Manual GMK 210 page 18 of 20
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15 Specifications
Measurement
Method
Capacitive (=dielectric) measuring methohd, non-destructive
Depth
2 selectable: approx. 10 mm and approx. 25 mm
Characteristic curves
15 characteristic curves for wood
additionally reference curve (rEF) for high-resolution relative
Resolution
0.1 %; for more than 19.9 %: 1 % (for both %u and %w)
Moisture rating
Display: Rating of the moisture in 6 levels from WET to DRY
Acoustic: Signal tone, depending on moisture rating
Accuracy
The achievable accuracy depends significantly on the application and
the properties of the measured material!
Display
2 displays for material and measured value, backlight
Accoustic signal
Moisture rating via relating acoustic signal
Hold function
Press button to freeze current value.
Working temperature
-25 to 50 °C; 0 to 80 % RH (non condensing)
Storage temperature
-25 to 70 °C
Power supply
9 V-battery type IEC 6F22 (included)
Power consumption
(measurement)
Approx. 0.12 mA (battery life time: more than 2500 hours for alkaline
battery)
Power consumption
(backlight)
Approx. 2.5 mA (Backlight reduces battery life time! Automatic turn off
function is selectable)
Used battery display

Auto off-function
Device will be automatically switched off if not operated for longer time
(adjustable from 1..120min)
Housing
impact-resistant ABS plastic housing, front side IP65
Dimension
Approx. 106 x 67 x 30 mm (H x W x D)
Weight
Approx. 135g incl. battery
EMC
The device corresponds to the essential protection ratings established
in the Regulations of the Council for the Approximation of Legislation
for the member countries regarding electromagnetic compatibility
(2004/108/EG), additional error: < 1% FS
16 Disposal Notes
Dispense exhausted batteries at destined gathering places.

To dispose this device, please send it directly to us (adequately stamped).
We will dispose it appropriately and environmentally friendly.

H68.0.02.6C-04 Operating Manual GMK 210 page 19 of 20
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Addendum A: Wood types table
english
lat.
charact.
Abachi
Triplochiton scleroxylon
d.45
Afzelia
Afzelia spp.
d.75
Ash, American-
Fraxinus americana
d.65
Ash, European-
Fraxinus excelsior
d.65
Ash, Manchurian-
Fraxinus mandshurica
d.60
Balau, Bangkirai-
Shorea laevis
d.90
Balau, Red-
Shorea guiso
d.85
Beech, European-
Fagus sylvatica
d.65
Bintangor
Calophyllum kajewskii
d.65
Birch,White-
Betula pubescens
d.60
Birch, Yellow-
Betula lutea
d.65
Bossè
Guarea cedrata
d.55
Bubinga
Guibourtia demeusii
d.85
Cedar, White
Melia azedarach
d.55
Cherry, Black-
Prunus serotina
d.60
Cherry, Wild-
Prunus avium
d.55
Cypressus
Cupressus spp.
d.45
Douglas-fir, Common-
Pseudotsuga menziesii
d.50
Douka
Thieghemella africana
d.65
Ebony
Diospyros spp.
d.99
Elm
Ulmus americ. / Ulmus
spp.
d.60
Fir, European Silver-
Abies alba
d.45
Fir, Grand-
Abies grandis
d.45
Fir, Pacific Silver-
Abies amabilis
d.45
Fir, Red-
Abies magnifica
d.45
Gum, Sweet
Liquidambar styraciflua
d.50
Hemlock
Tsuga heterophylla
d.45
Hickory
Carya spp.
d.75
Iroko
Chlorophora excesla
d.65
Jarrah
Eucalyptus marginata
d.75
Jelutong
Dyera costulata
d.45
Jeqituiba
Cariniana spp.
d.70
Kapur
Dryobalanops spp.
d.60
Karri
Eucalyptus diversicolor
d.85
Larch, European-
Larix decidua
d.55
Larch, Japanese-
Larix kaempferi
d.55
Larch, Western-
Larix occidentalis
d.55
Limba
Terminalia superba
d.50
Linden, American
Tilia americana
d.45
Linden, Common-
Tilia vulgaris
d.50
Locust, Black-
Robinia pseudoacacia
d.70
Magnolia, Cucumber-
Magnolia
acuminata/grandiflora
d.50
Mahogany
Swietenia spp.
d.50
Mahogany, African-
Khaya spp.
d.50
Mahogany, Philippine-
Parashorea plicata /
Shorea almon
d.50
Maple, New Guinea
Flindersia pimentelianan
d.55
Maple, Sugar-
Acer saccharum
d.70
Maple, Sycamore-
Acer pseudoplatanus
d.55
english
lat.
charact.
english
lat.
charact.
Mengkulang
Heritiera spp.
d.65
Meranti, Dark Red-
Shorea spp.
d.65
Meranti, White-
Shorea hypochra
d.55
Meranti, Yellow-
Shorea multiflora
d.55
Merawan
Hopea sulcala
d.70
Merbau
Intsia spp.
d.75
Mersawa
Anisoptera laevis
d.60
Messmate
Eucalyptus obliqua
d.80
Oak, Northern Red-
Quercus spp.
d.65
Oak, Sessile-
Quercus petraea
d.65
Oak, Sawtooth-
Quercus spp.
d.65
Oak, White-
Quercus spp.
d.65
Olive
Olea hochstetteri
d.85
Padouk, African-
Pterocarpus soyauxii
d.70
Paldao
Dracontomelum dao
d.65
Pine, Black-
Podocarpus spicatus
d.50
Pine, European Black-
Pinus nigra
d.55
Pine, Loblolly-
Pinus taeda
d.50
Pine, Lodgeole-
Pinus contorta
d.45
Pine, Longleaf-
Pinus palustris
d.60
Pine, Maritime-
Pinus pinaster
d.50
Pine, Norway-
Pinus resinosa
d.45
Pine, Parana-
Araucaria angustifolia
d.50
Pine, Ponderosa-
Pinus ponderosa
d.45
Pine, Radiata-
Pinus radiata
d.50
Pine, Scots-
Pinus sylvestris
d.50
Pine, Sugar-
Pinus lambertiana
d.45
Poplar, Black-
Populus nigra
d.45
Redcedar, Western-
Thuja plicata
d.45
Rengas
Gluta spp.
d.60
Rimu
Dacrydium cupressinum
d.50
Redwood, California-
Sequoia sempervirens
d.45
Rosewood, Brazilian
Dalbergia latifolia / -nigra
d.85
Rosewood, New Guinea-
Pterocarpus indicus
d.55
Rubber Tree
Hevea Brasiliensis
d.50
Sapele
Entandrophragma
cylindricum
d.65
Sipo
Entrandrophragma utile
d.60
Spruce
Picea abies
d.45
Spruce, Sitka-
Picea sitchensis
d.45
Tiama
Entandrophragma
angolense
d.55
Teak
Tectona grandis
d.65
Torem
Manilkara kanosiensis
d.95
Tualang
Koompassia excelsa
d.80
Walnut, Eastern Black-
Juglans nigra
d.60
Walnut, Common-
Juglans regia
d.60
Wenge
Millettia laurentii
d.80

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