Testo 770 range | True RMS clamp meter

Contact Instrument Solutions

The Testo 770 true RMS clamp meter instruments have signal detection capabilities that enables the meters to detect direct and alternating current and select other parameters such as resistance, continuity, diode and capacitance without interference by the user. With their unique fully retractable pincer arm, this allows you to grab wires without using your hands which makes it easier to take measurements in tight locations.

The Testo 770-1 model is the standard version for daily measuring tasks such as frequency measurement, True RMS and current measurement. The Testo 770-2 has a μA range as well as an integrated temperature adapter for all Type K thermocouples. In addition to these features, the Testo 770-3 offers a performance measurement function and can be connected with the Testo smart probes app via Bluetooth. In this app you can display the measurement progression as a graph and document it directly into a report.


  • Unique clamp mechanism to grab wires without using your hands makes it easier to work at tight measuring points
  • Auto AC / DC recognition for current and voltage measurements
  • True root mean square measurement - True RMS
  • Real-time power measurement (Watts) with simultaneous power factor indication (770-3 only)
  • Standard features: • Inrush / starting current capture • APO (auto power off) • Min / Max / Hold
  • Additional features (770-2/-3 only): • μA for flame rod • Type-K thermocouple • High capacitance • Frequency measurement
  • Bluetooth and connection to testo Smart Probes App (770-3 only)


Voltage measuring range     1 mV to 600 V AC/DC

Current measuring range      0.1 to 400 A AC/DC (770-1/-2), 0.1 to 600 A AC/DC (770-3)

μA measuring range     0.1 to 400 μA AC/DC (770-2/-3)

Resistance measuring range    0.1 Ω to 40 MΩ (770-1/-2), 0.1 Ω to 60 MΩ (770-3)

Frequency measuring range       0.001 Hz to 10 kHz

Capacity measuring range     0.001 μF to 100 μF (770-2/-2), 0.001 μF to 60,000 μF (770-3 version only)

Temperature measuring range     - 20 to +500 °C (770-2/-3 versions only)

Measurement category       CAT IV 600 V, CAT III 1,000 V

Operating temperature      - 10 to + 50 °C

Storage temperature      - 15 to + 60 °C

For further technical specification, please refer to the data sheet

Testo 755 range | Current / voltage testers
Testo 755 range | Current / voltage testers
The Testo 755 range of current voltage testers come complete with batteries and probes. They also have an integrated torch which enables work in poorly lit spaces.

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Testo 770 range of TRMS clamp meters data sheet.pdf Testo 770 range of TRMS clamp meters data sheet
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