Extech Instruments MO270 User manual

User Guide
Wireless Pin and Pinless Moisture Meter
Model: MO270
Includes
EX3000 Wireless Receiver and
MO270-X Wireless Moisture Meter

FCC warning statement:
This equipment has been tested and found to comply with the limits for a Class A
digital device, pursuant to part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference in a residential installation.
This equipment generates, uses and can radiate radio frequency energy and, if not
installed and used in accordance with the instructions, may cause harmful interference
to radio communications. However, there is no guarantee that interference will not
occur in a particular installation. If this equipment does cause harmful interference to
radio or television reception, which can be determined by turning the equipment off
and on, the user is encouraged to try to correct the interference by one or more of the
following measures:
•Reorient or relocate the receiving antenna.
•Increase the separation between the equipment and receiver.
•Connect the equipment into an outlet on a circuit different from that to which the
receiver is connected.
•Consult the dealer or an experienced radio/TV technician for help.
Caution: Any changes or modifications to this device not explicitly approved by
manufacturer could void your authority to operate this equipment.
This device complies with part 15 of the FCC Rules. Operation is subject to the
following two conditions: (1) This device may not cause harmful interference, and (2)
this device must accept any interference received, including interference that may
cause undesired operation.
RF warning statement:
The device has been evaluated to meet general RF exposure requirement. The device
can be used in portable exposure condition without restriction.

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Introduction
Congratulations on your purchase of the Extech MO270 Moisture Meter with full graphical display.
This meter includes MeterLinkTM Bluetooth capabilities for use with FLIR infrared cameras (such as
FLIR T/B200, T/B300, T/B360, T/B400 or i/b60 cameras). The MO270 detects moisture in wood
and other materials such as particle board, carpeting, and ceiling/bathroom tiles using a non-
invasive method (pinless); the MO270 also measures moisture in sheet rock and other building
materials using the pin method. This meter is shipped fully tested and calibrated and, with proper
use, will provide years of reliable service.
Features
Detachable sensors transmit data viewable on meter display from up to 65ft (20m)
Readings from up to eight (8) remote sensors can be viewed on meter
Meter can record data from up to forty (40) remote sensors simultaneously onto SD card
Wireless sensor affixes to 4 ft (1.2m) telescoping handle; Optional longer handles available
Wirelessly transmit moisture data to FLIR IR cameras via MeterLinkTM and Bluetooth
Wood Moisture equivalent (%WME) pin readings
Visual and audible High and Low Alarm modes
2-point calibration check built into protective cap
Includes 3.7V rechargeable Li-Polymer battery, wireless moisture sensor, external pin probe,
replacement pins, telescoping handle, AC adaptor, protective cap, 2G SD card, and hard case

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Description
Meter Front View
1. Electrode pins protective cap
2. Sensor release buttons
3. Display
4. Function buttons
5. Power button
6. Bluetooth status light (blue)
7. Navigation and OK buttons
Meter Side Views
1. Sensor release buttons
2. Video output
3. Audio output
4. RJ-45 remote probe port
5. Meter (receiver) USB port
6. Mini-SD card
7. Sensor (ransmitter) USB port
Meter Components
1. Contact pins
2. Non-Contact capacitive sensor
3. Sensor (transmitter)
4. Meter (Receiver)

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Display Icons
ICON
Name
Function
(black) Low alarm set Low alarm is set and active with sound
(black) High alarm set High alarm is set and active with sound
(black) Low alarm set Low alarm is set and active without sound
(black) High alarm set High alarm is set and active without sound
(red) Low alarm triggered Low alarm has been triggered
(red) High alarm triggered High alarm has been triggered
(B.T.) MeterLink mode Bluetooth is on, MeterLinkTM protocol is active
(gray) (B.T.) Transmitter ON Bluetooth is ON; PC protocol is active
(blue) (B.T.) Active pairing Bluetooth is ON; PC protocol is active
(gray) (RF) Wireless ON Wireless transmitter is ON; no communication
activity with sensor
(orange) (RF) wireless comm. Wireless transmitter is ON; communication with
sensors is active
(blue) REL mode Reading moisture using non intrusive sensors
WME mode Reading moisture using ‘pin’ sensors
External probe Reading measurement from external probe
(blue) Internal probe Reading measurements from internal probe
Recording Unit is actively recording content (on-screen)
(green)
Sensor (transmitter)
battery Sensor battery (fully charged)
(orange) Meter (Receiver) battery Meter battery (low)

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Setup
Getting Started
1. Charge the sensor and the meter batteries (refer to following section for full details on
battery charging).
2. To switch the meter ON, press and hold the button for 3 seconds; the navigation buttons
will illuminate and the display will switch ON. To power OFF, press and hold the power
button for 3 seconds.
3. The F1, F2 and F3 buttons are ‘soft keys’ meaning that their functions change with the
particular mode or screen that is active.
4. The ▲, ►, ▼and ◄buttons are used to navigate the menu selections.
5. The “OK” button is used to select the highlighted menu function.
Charging the Batteries
1. Charging will begin once the USB cable is connected between the mini-USB port on the
Sensor or the Meter and a PC USB port or an AC outlet. Connecting only the Meter USB
port charges both the Meter and the Sensor simultaneously (while they are physically
connected to each other).
2. Note that if you connect the meter to the PC via the USB port before switching the meter
ON, the meter screen will show these 3 selections when it is powered up:
PC CAM (reserved for future use)
Disk Drive (select this setting to view the meter’s stored readings on the PC using
optional WindowsTM software)
Charger (select this setting if the connection to the PC is to be used for charging
purposes)
3. To check the battery status:
a) Press and hold the button for 3 seconds to switch the meter ON.
b) The USB menu will appear. Navigate down to “Charger” and press OK.
c) The digital display measurement screen will appear showing the two battery icons at
the upper right side of the display.
d) The (Meter) and (Sensor) icons will be completely filled when the batteries are
fully charged.

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Operation
Basic Operation for Pin Measurments
CAUTION: The electrode measurement pins are extremely sharp. Use care when handling this
instrument. Cover the pins with the protective cap when the instrument is not in use.
1. Remove the protective cap to expose the electrode pins.
2. Press and hold the key for 3 seconds to switch the meter ON.
3. If the icon is displayed, proceed as follows to switch to the icon.
a) Press the MENU (F1) button and navigate to the WME/REL box.
b) Press OK, select WME, press OK and press EXIT.
4. Carefully push the electrode pins a minimum of 0.07” (2mm) into the material under test.
Note that the pins should be inserted into wood perpendicular to the wood’s fiber structure.
For high moisture readings, it may take several minutes for the meter reading to stabilize.
5. Take several readings in several locations on the material for the best representation of the
amount of moisture present.
6. Read the measurement values on the display
7. Replace the protective cap when finished.
Basic Operation for Pinless Measurments
1. Press and hold the key for 3 seconds to switch the meter ON.
2. If the icon is displayed, proceed as follows to switch to the icon.
a) Press the MENU (F1) button and navigate to the WME/REL box.
b) Press OK, select REL, press OK and press EXIT.
3. Press and hold the key for two seconds to switch the meter OFF
4. Keep hands and any surface away from the rear sensor and then press the key to
switch the meter ON. The meter will auto-zero during power-on.
5. The pinless moisture detector is located at the rear of the instrument, just behind the display.
6. Place the meter so that the rear sensor lays flat against the surface of the material under
test.
7. Take several readings in several locations on the material for the best representation of the
amount of moisture present.
8. Read the measurement values on the display.

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The SETTINGS Configuration Mode Basics
1. Turn the meter ON.
2. Press and Hold the OK button until the Main Menu appears
3. Press the F3 (settings) button to bring up the SETTINGS
menu
4. Navigate the menu and select sub-menus as desired. Details
for each setting are provided in the ‘SETTINGS Mode IN
DETAIL’ section of this guide below.
The SETTINGS Mode Menu Items in Detail
ALARM Settings
a) From the SETTINGS sub-menu, navigate to the ALARM box
and press OK.
b) Alarm limits can be set directly by a value entry or from a
measured (scanned) value.
c) Navigate to the value entry box or the scan box.
d) For value entry, scroll to the value entry box and press OK.
The digit-select red arrow will appear. Use the left/right arrows to move the red arrow. Use the
up/down arrow buttons to set the numerical value of the digit above the red arrow. Note that the
High Alarm cannot be set lower than 10.00% and the Low Alarm cannot be set higher than
10.00%.
e) When complete, press OK to capture the value and then press F3 button to store the value.
f) Re-enter the ALARMS screen for further adjustments.
g) For scanned entry, navigate to the SCAN box.
h) Take a measurement and then press the OK button to begin the scan. The measured values will
appear in the % box.
i) With the desired value in the box, press the OK button to capture the value and then press the
F3 EXIT button to store the value.
j) To turn the alarm ON or OFF: navigate back to the Alarm screen and use the arrow buttons to
move the cursor to the Alarm High and/or Alarm Low OFF box.
k) Press the OK button to toggle between ON (OFF) or OFF (OFF).
l) When complete, press the OK button to capture the settings and then press the F3 EXIT button
to store the setting.
m) To set the alarm beeper ON or OFF: Return to the Alarm screen and navigate to the SOUND
ON or OFF box. Select the desired condition, press OK and then press F3-EXIT.

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AUTO POWER OFF (APO) AND BACKLIGHT Settings
a) The APO or backlight timeout can be set in minutes.
b) Navigate to the APO/BL sub-menu in the SETTINGS mode.
c) Scroll to the desired setting.
d) Press OK and then press EXIT or BACK when done.
CHANNEL Setting
a) Up to 40 remote sensors can be identified on this screen. Up
to 8 sensors can be selected at any one time for viewing
remotely on the meter.
b) To set the channel, first navigate to the CHANNEL sub-menu
in the SETTINGS mode.
c) Navigate to the desired channel and then Press OK
d) Continue selecting channels (up to 8) and press EXIT or
BACK when done.
DATE/TIME and FORMAT Settings
a) To set the time and date, select DATE/TIME from the
SETTINGS menu and then scroll to the desired setting field
and press OK.
b) Use the left/right arrow keys to move the red triangular
pointer to digit that is to be changed
c) Use the up/down arrows to change a digit value.
d) Press OK to store the new value and to hide the red
triangular arrow.
e) To select a time format, scroll to the desired settings field and press OK.
f) Press EXIT or BACK when done.
DATA FORMAT Setting
a) To set the numerical delineator to a decimal point (.) or to a
comma (,) select DATA FORMAT from the SETTINGS
menu.
b) Scroll to the desired selection.
c) Press OK to select and then press EXIT or BACK when
done.
BLUETOOTH / PC Selection Setting
a) To activate the Bluetooth/MeterLinkTM function so as to
communicate with a FLIR camera, select BLUETOOTH from
the SETTINGS menu.
b) Scroll to METERLINK MODE and press OK
c) Select PC mode if the meter is to be connected directly to a
PC for two-way communication using optional software.

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d) Select OFF if no communications will be used.
e) Press BACK or EXIT when done.
ZERO CLEAR
a) To set the ZERO CLEAR function to MANUAL or AUTO,
select ZERO CLEAR from the SETTINGS menu.
b) Use the arrow keys to select MANUAL or AUTO.
c) Press OK to select and then press BACK or EXIT when done.
SYSTEM INFORMATION (INF)
a) To view the System Information, select SYSTEM INF from the
SETTINGS menu
b) The only parameters that can be changed on this screen are
OWNER NAME and NUMBER.
c) Scroll to the OWNER NAME or NUMBER field and then press
OK.
d) An alpha-numerical screen will appear allowing the user to
select text using the arrow and OK buttons.
e) Press BACK or EXIT when done.

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Measure Screen Menus
F1 - MENU
Press the F1 MENU button from the main meter display to open
four sub-menus;
SOURCE:
The SOURCE menu allows for selection of remote moisture
transmitters. No selection is necessary for normal meter
operation. The SOURCE sub-menu also permits the renaming of sensor identifiers, sensor
scanning, and a ‘clear all’ utility.
MEMORY:
The MEMORY menu allows for viewing data and naming/clearing data for up to 10 memory
groups. Refer to the dedicated ‘Memory Logging Mode’ section later in this guide.
WOOD TYPES:
The WOOD TYPES menu allows for selecting various species of wood which are arranged in
three wood groups according to hardness. Note that there is also one building material group.
WME/REL
The WME/REL menu allows for selecting either pin measurements displayed in wood moisture
equivalent as a % (WME) or pinless relative measurements (REL) using the non- contact sensor.
F2 - MODE
Press the F2 MODE button to see the three display modes: Digital display, Graphical Trend Analysis
display, and Analog display. The digital display includes a bargraph at the bottom of the graphical
display. Note that the bargraph is color-coded where the alarm region is shown in red and the
acceptable region in green. For more on the Trend Analysis display refer to the Trend Analysis section
later in this guide.
F3 - HOLD
The HOLD menu freezes the displayed reading. Sub-menus allow for saving the data to memory
or exiting the mode.

This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference in a residential installation. This equipment generates, uses and can
radiate radio frequency energy and, if not installed and used in accordance with the instructions,
may cause harmful interference to radio communications. However, there is no guarantee that
interference will not occur in a particular installation. If this equipment does cause harmful
interference to radio or television reception, which can be determined by turning the equipment off
and on, the user is encouraged to try to correct the interference by one or more of the following
measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
FCC warning statement

Caution: Any changes or modifications to this device not explicitly approved by manufacturer could
void your authority to operate this equipment.
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1) This device may not cause harmful interference.
(2) this device must accept any interference received, including interference that may cause undesired operation.
The device has been evaluated to meet general RF exposure requirement. The device can be used
in portable exposure condition without restriction.
RF warning statement:

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Memory Logging Mode
Store a reading
To store a reading into one of the ten memory locations (Groups) press the F2-MODE soft-key
from the main display screen. Note that stored readings are date/time stamped.
Now use the F2-MODE soft-key again to select the Analog pointer or the Digital display mode.
Take a measurement and when the desired reading is displayed, press the F3-HOLD soft-key.
Press the F1-SAVE soft-key to begin the storing process. The memory locations screen will
appear.
Select a memory Group using the arrow buttons. Press the OK button when the desired memory
location is highlighted. The reading will now be stored in the selected memory group.
View stored readings
To view data from a memory group, press the F1-MENU soft-key from the main display screen
and navigate to the MEMORY sub-menu and press OK.
Highlight VIEW from the sub-menu and press OK. The groups list will appear.
Navigate to the desired group and press OK.
Use the up/down arrow buttons to scroll through the readings in the group. Use the CLEAR
button to delete a displayed reading.
Press F1-BACK to return to the Groups list or press EXIT to return to the normal operating mode.
Rename a Memory Group
To rename a memory group, press the F1-MENU soft-key from the main display screen and
navigate to the MEMORY sub-menu and press OK.
Highlight NAME from the sub-menu and press OK. The groups list will appear.
Navigate to the desired group and press OK.
An alpha-numerical screen will appear with the current group name shown at the top.
Use the arrow keys to select the desired digit to change and then press OK.
Now scroll to the new digit using the arrow keys. When the desired new digit is highlighted, press
OK and the old digit will be replaced by the new digit.
When editing is complete, press CONF to save entries and to return to the Groups list.
Deleting Memory
To delete stored data, press the F1-MENU soft-key from the main display screen and navigate to
the MEMORY sub-menu and press OK.
Highlight CLEAR from the sub-menu and press OK.
Three sub-menus will appear: INDIVIDUAL, GROUP, and ALL. Select INDIVIDUAL to delete one
reading from within one group; Select GROUP to delete an entire group; and select ALL to delete
all readings in all groups. Click OK to clear the item.

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Calibration Verification
Calibration Zero Check for Pinless Mode
1. Switch the meter to the Pinless mode of operation (REL mode) from the F1-MENU.
2. Ensure that the meter is not near any objects or surfaces. Hold the meter near the bottom to
avoid contact with the pinless sensor.
3. The display should read zero.
4. If an error is displayed or if the meter reads other than zero, please return the unit for service.
Calibration Check for Pin Mode
1. Switch the meter to the Pin mode (%WME) from the F1-MENU.
2. The three calibration check points are located in the holes at the top of the protective cap.
3. The first measurement is made between the left test point and the center test point. The
second measurement is made between the right test point and the center test point.
4. The display should read 75 for the first measurement and 25 for the second measurement.
5. If the readings are not correct, return the meter for service.

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Battery Replacement
If the instrument does not switch ON or displays low battery symbols, recharge the batteries as
detailed earlier in this guide. If the batteries require replacement, the unit must be returned to
Extech for service.
Maintenance
Always keep the instrument dry
To clean, wipe the meter with a damp cloth. Use a mild detergent if necessary but never use
abrasives or solvents.
Prevent dirt from accumulating at the electrode pins
Specifications
Display Full color graphical display
Resolution 0.1%
Accuracy Pin mode: ± (5% rdg + 5 digits)
Pinless mode is a relative reading only
Measurement principle Electrical resistance (pins)
Electromagnetic sensor (pinless)
Range 0.0 to 99.9 % Relative (pinless)
6.0 to 99.9 % WME (pins)
Electrode pin length 0.75” (22mm)
Electrode pin type Integrated, replaceable
Transmission frequency Meter/sensor communication frequency: 2.4GHz
Power supply Rechargeable Li-Polymer batteries (not user replaceable)
Low Battery Indication Battery symbols (for meter and sensor) displayed on LCD
Meter housing Impact-proof plastic
Operating Temperature 0 to 50oC (32 to 122oF)
Operating Humidity 80% Relative Humidity maximum
Dimensions 203 x 58 x 43mm (8 x 2.3 x 1.7”); not including remote probe
Weight 204g. (7.2 oz); not including remote probe
Copyright ©2011 Extech Instruments Corporation (a FLIR company)
All rights reserved including the right of reproduction in whole or in part in any form.