HT HT211 User manual
Copyright HT ITALIA 2019 Release EN 3.01 10/07/2019
ENGLISH
User manual
HT211
EN - 1
TABLE OF CONTENTS
1.SAFETY PRECAUTIONS AND PROCEDURES ..........................................................2
1.1.Preliminary ........................................................................................................................ 2
1.2.During use......................................................................................................................... 3
1.3.After use............................................................................................................................ 3
1.4.Measuring (overvoltage) categories definitions................................................................. 3
2.GENERAL DESCRIPTION ...........................................................................................4
3.PREPARATION FOR USE ...........................................................................................4
3.1.Initial.................................................................................................................................. 4
3.2.Supply voltage................................................................................................................... 4
3.3.Storage.............................................................................................................................. 4
4.NOMENCLATURE........................................................................................................5
4.1.Instrument description....................................................................................................... 5
4.2.Description of function keys .............................................................................................. 6
4.2.1.HOLD/ key ............................................................................................................................. 6
4.2.2.RANGE key ................................................................................................................................ 6
4.2.3.MAX MIN key.............................................................................................................................. 6
4.2.4.MODE key .................................................................................................................................. 6
4.2.5.Auto Power OFF......................................................................................................................... 6
5.OPERATING INSTRUCTIONS.....................................................................................7
5.1.DC Voltage measurement ................................................................................................. 7
5.2.AC Voltage measurement ................................................................................................. 8
5.3.Frequency and Duty Cycle measurements ....................................................................... 9
5.4.Resistance measurements.............................................................................................. 10
5.5.Diode test and Continuity test ......................................................................................... 11
5.6.Capacitance measurement ............................................................................................. 12
5.7.Temperature measurement with type K probe ................................................................ 13
5.8.DC Current measurement ............................................................................................... 14
5.9.AC Current measurement ............................................................................................... 15
6.MAINTENANCE..........................................................................................................16
6.1.General information......................................................................................................... 16
6.2.Batteries and fuses replacement..................................................................................... 16
6.3.Cleaning .......................................................................................................................... 16
6.4.End of life ........................................................................................................................ 16
7.TECHNICAL SPECIFICATIONS.................................................................................17
7.1.Technical features........................................................................................................... 17
7.1.1.Reference guidelines................................................................................................................ 19
7.1.2.General data............................................................................................................................. 19
7.2.Environment .................................................................................................................... 19
7.2.1.Environmental conditions ......................................................................................................... 19
7.3.Accessories..................................................................................................................... 19
7.3.1.Standard accessories............................................................................................................... 19
7.3.2.Optional accessories ................................................................................................................ 19
8.SERVICE....................................................................................................................20
8.1.Warranty conditions......................................................................................................... 20
8.2.After-sale service............................................................................................................. 20
HT211
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1. SAFETY PRECAUTIONS AND PROCEDURES
This meter is compliance with safety Standard IEC/EN61010-1 related to electronic
measuring instruments. For your own safety and to avoid damaging the instrument follow
the procedures described in this instruction manual and read carefully all notes preceded
by this symbol .
When taking measurements:
Avoid doing that in humid or wet places
Avoid doing that in rooms where explosive gas, combustible gas, steam or excessive
dust is present
Keep you insulated from the object under test
Do not touch exposed metal parts such as test lead ends, sockets, fixing objects,
circuits etc.
Avoid doing that if you notice anomalous conditions such as breakages, deformations,
fractures, leakages of battery liquid, blind display etc
Be particularly careful when measuring voltages exceeding 20V to avoid risks of
electrical shocks
The following symbols are used:
CAUTION - refer to the instruction manual - an improper use may damage the
instrument or its components
Double insulated meter
AC Voltage and Current
DC Voltage and Current
Ground reference
1.1. PRELIMINARY
This instrument has been designed for use in environments of pollution degree 2
It can be used for VOLTAGE and CURRENT measurements on installations of CAT III
600V
You must comply with the usual safety regulations aimed at protecting you against the
dangerous electric current and protecting the instrument against an incorrect operation
Only the original test leads supplied along with the instrument guarantee compliance
with the safety standards in force. They must be in a good conditions and, if necessary,
replaced with identical ones
Do not test nor connect to any circuit exceeding the specified overload protection
Do not take measurements under environmental conditions exceeding the limits
indicated in § 6.2.1
Make sure that battery is correctly installed
Before connecting the test probes to the installation make sure that the rotary selector
is positioned on the right function
Make sure that LCD and rotary selector indicate the same function
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1.2. DURING USE
Read the recommendations which follow and the instructions in this manual:
CAUTION
An improper use may damage the instrument and/or its components or injure
the operator.
When changing the range, first disconnect the test leads from the circuit under test in
order to avoid any accident
When the instrument is connected to measuring circuits never touch any unused
terminal
When measuring resistors do not add any voltage. Although there is a protection
circuit, excessive voltage could cause malfunctioning
If during measurement the displayed values remain constant check whether the HOLD
function is active
1.3. AFTER USE
After using the instrument turn it off
If you expect not to use the instrument for a long period remove the battery to avoid
leakages of battery liquids which may damage its inner components
1.4. MEASURING (OVERVOLTAGE) CATEGORIES DEFINITIONS
The IEC/EN61010-1: Safety requirements for electrical equipment for measurement,
control and laboratory use, Part 1: General requirements, gives a definition of measuring
category, usually called overvoltage category. § 6.7.4: Measuring circuits:
Circuits are divided into the following measurement categories:
Measurement category IV is for measurements performed at the source of the low-
voltage installation
Examples are electricity meters and measurements on primary overcurrent protection
devices and ripple control units
Measurement category III is for measurements performed in the building installation.
Examples are measurements on distribution boards, circuit breakers, wiring, including
cables, bus-bars, junction boxes, switches, socket-outlets in the fixed installation, and
equipment for industrial use and some other equipment, for example, stationary
motors with permanent connection to fixed installation
Measurement category II is for measurements performed on circuits directly
connected to the low voltage installation
Examples are measurements on household appliances, portable tools and similar
equipment
Measurement category I is for measurements performed on circuits not directly
connected to MAINS
Examples are measurements on circuits not derived from MAINS, and specially
protected (internal) MAINS-derived circuits. In the latter case, transient stresses are
variable; for that reason, the norm requires that the transient withstand capability of the
equipment is made known to the user
HT211
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2. GENERAL DESCRIPTION
The instrument performs the herewith measurements:
DC Voltage
AC TRMS Voltage
DC Current
AC TRMS Current
Resistance and Continuity test
Capacitance
Frequency
Duty cycle
Diode test
Temperature with type K probe
All selectable by means of a rotary selector. Also are available the function keys (see §
4.2) and backlight feature.. The instrument disposes of an Auto Power OFF function
consisting in an automatic switching off 15 minutes after last selector rotation.
3. PREPARATION FOR USE
3.1. INITIAL
This instrument was checked both mechanically and electrically prior to shipment. All
possible cares and precautions were taken to let you receive the instrument in perfect
conditions. Notwithstanding we suggest you to check it rapidly (eventual damages may
have occurred during transport – if so please contact the local distributor from whom you
bought the item). Make sure that all standard accessories mentioned in § 7.3.1 are
included. Should you have to return back the instrument for any reason please follow the
instructions mentioned in § 8.
3.2. SUPPLY VOLTAGE
The instrument is supplied by 2x1.5V battery type AAA IEC LR03 When battery is low, a
“” low battery indication is displayed. To replace/insert battery please refer to § 6.2.
3.3. STORAGE
After a period of storage in extreme environmental conditions exceeding the limits
mentioned in § 7.2.1 let the instrument resume normal measuring conditions before using
it.
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4. NOMENCLATURE
4.1. INSTRUMENT DESCRIPTION
CAPTION:
1. Display LCD
2. MODE key
3. HOLD key
4. RANGE key
5. MAX MIN key
6. Function selector
7. 10A input jack
8. mAµAVHz% input
jack
9. COM input jack
Fig. 1: Instrument description
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4.2. DESCRIPTION OF FUNCTION KEYS
4.2.1. HOLD/ key
By pressing HOLD key the measured value is frozen on the display where the symbol
""HOLD"appears. Pressing again HOLD to disable this function and resume normal
operation. By pressing the key at least 1s the enable/disable of backlight feature can be
performed. This feature is active for any position of rotary selector and automatically
disabled after approx. 30s.
4.2.2. RANGE key
By pressing RANGE key, the manual mode is activated and the “AUTO” symbol
disappears from the display. Press RANGE cyclically to change the measuring range and
fix the decimal point on the display. To restore the autorange keep RANGE key pressed
for at least 1s or rotate the selector to another position. This feature is not active in Hz%,
/, °C°F and positions.
4.2.3. MAX MIN key
Pressing the MAX MIN key once activates the detection of maximum and minimum values
of the quantity being tested. Both values are constantly updated and are displayed
cyclically every time the same key is pressed again. The display shows the symbol
associated with the selected function: “MAX” for maximum value and “MIN” for minimum
value. The flashing symbol “MAX MIN” shows the current value on the display. The MAX
MIN key is not active when the HOLD function is activated. The function is not active for
measurements Hz%, / and . Long pressing the MAX MIN key (or upon switching
on the instrument again) allows quitting the function.
4.2.4. MODE key
By pressing MODE key the selection of a double measured functions which are present at
display is performed. In particular this key is active in Hz%, /, °C°F positions
and to select between AC or DC voltage/current measurements.
4.2.5. Auto Power OFF
The instrument automatically turns off 15 minutes after last pressure of keys or last
selector rotation. To resume operation turn the selector on OFF and turn on the instrument
again.
HT211
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5. OPERATING INSTRUCTIONS
5.1. DC VOLTAGE MEASUREMENT
CAUTION
The maximum input for DC voltage is 600V. Do not attempt to measure
higher voltages to avoid electrical shocks or damages to the instrument.
Fig. 2: Using the meter for DC Voltage measurement
1. Switch on Vposition. “DC” symbol is displayed
2. Insert the test leads into the jacks, the red plug into mAµAVHz% jack and
black plug into COM jack
3. Connect the red and black test leads to the positive and negative poles of the circuit
under test respectively (see Fig. 2). The voltage value is displayed
4. If the message "O.L" is displayed the higher range is reached
5. The symbol "-" on the instrument display indicates that voltage has opposite direction
with regard to the connection of Fig. 2
6. For use of HOLD, RANGE, MAX MIN functions please refer to § 4.2
HT211
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5.2. AC VOLTAGE MEASUREMENT
CAUTION
The maximum input for AC voltage is 600V. Do not attempt to measure
higher voltages to avoid electrical shocks or damages to the instrument.
Fig. 3: Using the instrument for AC Voltage measurement
1. Switch on VHz% position
2. Insert the test leads into the jacks, the red plug into mAµAVHz% jack and
black plug into COM jack
3. Connect the test leads to the circuit under test (see Fig. 3). The voltage value is
displayed
4. If the message "O.L" is displayed the higher range is reached
5. For use of HOLD, RANGE, MAX MIN functions please refer to § 4.2
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5.3. FREQUENCY AND DUTY CYCLE MEASUREMENTS
CAUTION
The maximum input for AC voltage is 600V. Do not attempt to measure
higher voltages to avoid electrical shocks or damages to the instrument.
Fig. 4: Using the instrument for Frequency and Duty Cycle measurements
1. Switch on VHz% position
2. Press the MODE key until the symbol “Hz” is shown at display
3. Insert the test leads into the jacks, the red plug into mAµAVHz% jack and
black plug into COM jack
4. Connect the test leads to the circuit under test (see Fig. 4). The frequency value is
displayed
5. If the message "O.L" is displayed the higher range is reached
6. Press the MODE key until the symbol “%” is shown at display to meaning the Duty
Cycle test and connect the meter as frequency measurement. The measured value is
displayed
7. For HOLD function please refer to § 4.2
HT211
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5.4. RESISTANCE MEASUREMENTS
CAUTION
Before taking resistance measurements in circuit remove power from the
circuit being tested and discharge all capacitors.
Fig. 5: Using the instrument for Resistance measurement
1. Switch on . position. “M” symbol is displayed
2. Insert the test leads into the jacks, the red plug into mAµAVHz% jack and
black plug into COM jack
3. Connect the test leads to the circuit under test (see Fig. 5). The resistance value is
displayed
4. If the message "O.L" is displayed the higher range is reached
5. For HOLD function refer to § 4.2
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5.5. DIODE TEST AND CONTINUITY TEST
CAUTION
Before taking diode test measurements in circuit remove power from the
circuit being tested and discharge all capacitors.
Fig. 6: Using the instrument for Diode test and Continuity test
1. Switch on position
2. Press the MODE key until the symbol “ ”is shown at display
3. Insert the test leads into the jacks, the red plug into mAµAVHz% jack and
black plug into COM jack
4. Connect the test leads to the diode under test observing the proper polarities (see Fig.
6 – right part). The threshold voltage value under this situation is displayed
5. If the threshold voltage value is 0V the diode P-N junction is shorted circuit
6. If the message "O.L" is displayed the diode terminals are reversed, the diode P-N
junction is damaged
7. Press the MODE key until the symbol “ ” is shown at display to meaning the continuity
test and connect the meter as resistance measurement (Fig. 6 – left part). Buzzer emits
sound if the measured resistance value is <50
8. For HOLD function refer to § 4.2
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5.6. CAPACITANCE MEASUREMENT
CAUTION
Before taking capacitance measurement in circuit remove power from the
circuit being tested and discharge all capacitors. Connect the test capacitor
to the inputs respecting the polarity connections when required.
Fig. 7: Using the instrument for Capacitance measurement
1. Switch on
2. Press the MODE key until the “nF” symbol is shown at display
3. Insert the test leads into the jacks, the red plug into mAµAVHz% jack and
black plug into COM jack
4. Connect the red and black test clamps to the capacitor terminals respecting if
necessary the proper polarities (see Fig. 7). The capacitance value is shown on display
5. If the message "O.L" is displayed the higher range is reached
6. For HOLD function refer to § 4.2
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5.7. TEMPERATURE MEASUREMENT WITH TYPE K PROBE
CAUTION
Before taking temperature measurements in circuit remove power from the
circuit being tested and discharge all capacitors.
Fig. 8: Using the instrument for Temperature measurement
1. Switch on °C°F position.
2. Press the MODE key selecting the “°C” or “°F” unit
3. Insert the standard adapter accessory into mAµAVHz% jack (+ polarity),
and COM jack (- polarity) (see Fig. 8)
4. Connect the standard bead type K probe or the optional type K probe (see § 7.3.2) into
the adapter with respect the correct positive and negative polarity then temperature
reading is displayed
5. If the message "O.L" is displayed the higher range is reached
6. For HOLD function measurement refer to § 4.2
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5.8. DC CURRENT MEASUREMENT
CAUTION
The maximum input for DC current is 10A (10A input) or 400mA
(mAµAVHz% input).. Do not attempt to measure higher currents
to avoid electrical shocks or damages to the instrument.
Fig. 9: Using the instrument for DC Current measurement
1. Power off the circuit under test
2. Switch on “A”, “mA ” o “10A ”
3. Press the MODE key until the “DC” symbol is shown at display
4. Insert the test leads into the jacks, the red plug into 10A or mAµAVHz%
jack and black plug into COM jack
5. Connect the red and the black plugs in series with the circuit whose current is to be
measured respecting the polarities (see Fig. 9)
6. Energize the circuit under test. The current value will be displayed.
7. The message "O.L" means that the detected current exceeds the limits.
8. The symbol "-" on the instrument display indicates that voltage has opposite direction
with regard to the connection.
9. For use of HOLD, RANGE, MAX MIN functions please refer to § 4.2
HT211
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5.9. AC CURRENT MEASUREMENT
CAUTION
The maximum input for DC current is 10A (10A input) or 400mA
(mAµAVHz% input).. Do not attempt to measure higher currents
to avoid electrical shocks or damages to the instrument.
Fig. 10: Using the instrument for AC Current measurement
1. Power off the circuit under test
2. Switch on “A”, “mA ” o “10A ”
3. Insert the test leads into the jacks, the red plug into 10A or mAµAVHz%
jack and black plug into COM jack
4. Connect the red and the black plugs in series with the circuit whose current is to be
measured (see Fig. 9)
5. Energize the circuit under test. The current value will be displayed.
6. The message "O.L" means that the detected current exceeds the limits.
7. For use of HOLD, RANGE, MAX MIN functions please refer to § 4.2
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6. MAINTENANCE
6.1. GENERAL INFORMATION
While using and storing the instrument, carefully observe the recommendations listed in
this manual in order to prevent possible damage or danger during use. Do not use the
instrument in environments with high humidity levels or high temperatures. Do not expose
to direct sunlight. Always switch off the instrument after use. In case the instrument is not
to be used for a long time, remove the battery to avoid liquid leaks that could damage the
instruments internal circuits
6.2. BATTERIES AND FUSES REPLACEMENT
When the “ ” indication is displayed the batteries are to be replaced.
CAUTION
Only expert and trained technicians should perform maintenance
operations. Before carrying out maintenance operations, disconnect all
cables from the input terminals.
Batteries replacement
1. Turn OFF the instrument
2. Disconnect the test leads from the input terminals
3. Remove the two fixing screws and detach the battery cover
4. Replace the batteries with a new one of the same type (refer to § 7.1.2) observing the
proper polarities
5. Replace the battery cover and screws
6. Use the appropriate battery disposal methods for your area
Fuses replacement
1. Turn OFF the meter and disconnect the test leads from the input terminals
2. Remove the two fixing screws and detach the battery cover
3. Remove the defective fuse and install a new fuse of the same size and rating (see §
7.1.2)
4. Restore the battery cover
6.3. CLEANING
Use a soft and dry cloth to clean the instrument. Never use wet cloths, solvents, water, etc.
6.4. END OF LIFE
CAUTION: this symbol indicates that equipment, the battery and its accessories
shall be subject to a separate collection and correct disposal.
HT211
EN - 17
7. TECHNICAL SPECIFICATIONS
7.1. TECHNICAL FEATURES
Accuracy indicated as ±[%rdg + (num. dgt * resolution)] referred to 23°C±5°C, <80%RH.
DC Voltage (Autorange)
Range Resolution Accuracy Input impedance Overload protection
400.0mV 0.1mV (2.0%rdg+8dgt)
10M600VDC/ACrms
4.000V 0.001V
(2.0%rdg+3dgt)
40.00V 0.01V
400.0V 0.1V
600V 1V (1.2%rdg+3dgt)
AC TRMS Voltage (Autorange)
Range Resolution Accuracy (*)
(50Hz 400Hz) Input impedance Overload protection
4.000V 0.001V (2.0%rdg+5dgt)
10M600VDC/ACrms
40.00V 0.01V (1.5%rdg+3dgt)
400.0V 0.1V
600V 1V (2.0%rdg+4dgt)
(*) Accuracy referred to sinusoidal waveform. For not sinusoidal waveform the accuracy is (10.0%rdg+5dgt)
DC Current
Range Resolution Accuracy Overload protection
400.0A 0.1A
(1.5%rdg+3dgt) Fast fuse 500mA / 600V
4000A 1A
40.00mA 0.01mA
400.0mA 0.1mA
4.000A 0.001A (2.5%rdg+5dgt) Fast fuse 10A / 600V
10.00A 0.01A
AC TRMS Current
Range Resolution Accuracy (*)
(50Hz 400Hz) Overload protection
400.0A 0.1A (2.0%rdg+5dgt)
Fast fuse 500mA/600V
4000A 1A
(2.5%rdg+5dgt)
40.00mA 0.01mA
400.0mA 0.1mA
4.000A 0.001A (3.0%rdg+7dgt) Fast fuse 10A/600V
10.00A 0.01A
(*) Accuracy referred to sinusoidal waveform. For not sinusoidal waveform the accuracy is (10.0%rdg+5dgt)
Resistance and Continuity test
Range Resolution Accuracy Buzzer Overload protection
400.00.1(1.0%rdg + 4dgt)
<50250VDC/ACrms
4.000k0.001k
(1.5%rdg + 5dgt)
40.00k0.01k
400.0k0.1k
4.000M0.001M
40.00M0.01M
Diode Test
Feature Max open voltage Overload protection
approx 1.5VDC 250VDC/ACrms
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EN - 18
Frequency (Autorange)
Range Resolution Accuracy Sensitivity Overload protection
9.999Hz 0.001Hz
(1.0%rdg + 5dgt) >5Vrms 250VDC/ACrms
99.99Hz 0.01Hz
999.9Hz 0.1Hz
9.999kHz 0.001kHz
Duty cycle (Autorange)
Range Resolution Accuracy Sensitivity Overload protection
0.1%99.9% 0.1% (1.2%rdg + 3dgt) >1Vrms 250VDC/ACrms
0.01ms< pulse width <10ms; Frequency range: 10Hz 10kHz
Capacitance (Autorange)
Range Resolution Accuracy Overload protection
40.00nF 0.01nF (5.0%rdg + 35dgt)
250VDC/ACrms
400.0nF 0.1nF
(3.0%rdg + 5dgt)
4.000F 0.001F
40.00F 0.01F
400.0F 0.1F (4.0%rdg +5dgt)
4000F 1F (5.0%lrdg +5dgt)
Temperature with type K probe
Range Resolution Accuracy (*) Overload protection
-20.0°C ÷ 760.0°C 0.1°C (3.0%rdg + 5°C) 250VDC/ACrms
-4.0°F ÷ 1400.0°F 0.1°F (3.0%rdg + 9°F)
(*) Accuracy of only instrument without probe
HT211
EN - 19
7.1.1. Reference guidelines
Safety: IEC/EN61010-1
EMC: IEC/EN61326-1
Insulation: double insulation
Pollution degree: 2
Measurement category: CAT III 600V to ground
7.1.2. General data
Mechanical characteristics
Dimensions (L x W x H): 145 x 70 x 60mm (6 x 3 x 2in)
Weight (including batteries): 245g (9 ounces)
Mechanical protection: IP40
Power supply
Battery type: 2x1.5V batteries AAA IEC LR03
Low battery indication: symbol “ ” is displayed
Battery life: ca 20h (backlight ON), ca 190h (backlight OFF)
Fuses: F10A/600V, 5 x 20mm (10A input)
F500mA/600V, 5 x 20mm (mAAinput)
Auto Power OFF: after 15 minutes of idleness (not disabled)
Display
Specifications: 3 ¾ LCD, 4000 counts + sign, decimal point
and backlight
Sampling rate: 2 times/second
Conversion: TRMS
7.2. ENVIRONMENT
7.2.1. Environmental conditions
Reference temperature: 23°C±5°C (73°F±41°F)
Working temperature: 5°C ÷ 40°C (41°F 104°F)
Relative humidity: <80%RH
Storage temperature: -20°C÷ 60°C(-4°F 140°F)
Storage humidity: <80%RH
Max height of use: 2000m (6562ft)
This instrument satisfies the requirements of Low Voltage Directive 2014/35/EU
(LVD) and of EMC Directive 2014/30/EU
This instrument satisfies the requirements of European Directive 2011/65/EU (RoHS)
and 2012/19/EU (WEEE)
7.3. ACCESSORIES
7.3.1. Standard accessories
Test leads
Adapter + type K bead probe
Battery
Carrying case
User manual
7.3.2. Optional accessories
Type K probe for air and gas Cod. TK107
Type K probe for semi solid substances Cod. TK108
Type K probe for liquid Cod. TK109
Type K probe for surfaces Cod. TK110
Type K probe for surfaces with a 90° lead Cod. TK111
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