100 A high current micro-ohmmeter

  • BSG mode (Both Side Grounded)
  • Direct reading (up to 4½ digits)
  • Resolution: 0.1 μΩ
  • Resistance reading: up to 300 mΩ
  • Overheating protection
  • Open Modbus protocol: Can be remote controlled through an Android app or through USB by customized software, labview and PLC


The MPK105R high-current micro-ohmmeter is a portable, microprocessor-controlled instrument. Has optimized filters and protections for measurements in electrical substations. Can be used to accurately measure very low contact resistances of high voltage circuit-breakers and switches, busbars, etc., with test currents from 5 A up to 100 A. It employs the 4 terminals-method (U/I measuring principle) to avoid errors caused by test leads and their contact resistances.

Measurement accuracy is guaranteed by a state-of-the-arts signal amplification system, offset-free and of high long-term stability. Resistances readings are shown in the alphanumeric display with up to 4½ digits-resolution. It allows to measure resistances up to 300 mΩ, and the best resolution is 0.1 µΩ.

The high-current generation system is based on modern technology that allows to significantly decrease both its weight (approx. 11 kg) and size. The cabinet is made of plastic material highly resistant to impacts and to environmental challenges. Internal thermal sensors in all sensitive components avoid any damage caused to the instrument due to overheating.

This is a strong but lightweight equipment, and may be easily carried by one person. It is water-resistant and can be used under severe weather conditions (IP65 with closed lid) offering an excellent performance working both in the laboratory and out in the field.

Technical specifications

Test current

From 5 A up to 100 A (True DC)
The test current can be adjusted in steps of 0.2 A from 5 A to 20 A and steps of 1 A from 20 A to 100 A.

Resistance ranges

0.1 μΩ up to 2 mΩ (0.1 μΩ resolution)
2 mΩ up to 300 mΩ (10 μΩ resolution).

Measurement principle

Four-terminal, U/I.


Protections against overheating, overcurrent and short-circuit.

Programmable test time

Allows to setup the test duration from 15 seconds up to 120 seconds for current test from 5 A up to 100 A

Basic accuracy

± 1 % of reading from 50 μΩ to 300 mΩ.

Auxiliary clamp measurement range

0.1 ADC to 60 ADC.

Auxiliary clamp reading accuracy

1 % + 3 digits.

Advanced features

Digital direct reading of very low resistances in the alphanumerical display, with up to 4½ digits. Very fast and accurate measurements.

Communication protocol


Built-in memory

Memory for storing up to 4000 readings organized by records.

Serial data output

USB, for configuration, control and download the stored values.


For configuration and control.

Environmental protection

IP65 (with closed lid).


In accordance with IEC 61010-1.

Power supply

Mains: 100-240 V~.

Operating temperature

14 °F to 122 °F (-10 °C to 50 °C).

Storage temperature

-13 °F to 158 °F (-25 °C to 70 °C).

Humidity range

95% RH (non condensing).

Equipment weight

approx. 24.25 lb (11 kg).


19.76" x 15.51" x 7.48" (502 x 394 x 190 mm).

Included accessories

• Auxiliary current clamp
• Ground cable
• Power cord
• USB cable
• Case for the accessories
• User manual
• T-Logger software (download)
• Tentech Remote Control app (download)

Optional accessories

• 2 Combined current and potential leads - 19.68 ft (6 meters)
• 2 Combined current and potential leads - 26.24 ft (8 meters)
• 2 Combined current and potential leads - 32.80 ft (10 meters)
• 2 Combined current and potential leads - 39.37 ft (12 meters)
• 2 Combined current and potential leads - 49.21 ft (15 meters)

Remote control by Android device

This instrument has Bluetooth® interface and can be controlled remotely via an Android™ smartphone / tablet running the TENTECH's remote control application.

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Go to Google Play Store

• Android™ and Google Play™ Store are trademarks of Google, Inc.
• Bluetooth® is a registered trademark of Bluetooth SIG, Inc. worldwide.

Company history
13 Years


Customer service
Phone: +1 305 938 0389

Phone: +1 305 938 0389