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The testo 770 Clamp Meters are ideal for contactless measurements with our unique retractable slide clamp. Measuring live circuits has NEVER been easier or safer, due to our design that allows easy maneuverability in tight spaces!

testo 770 Clamp Meter advantages

Retractable Slide Clamp

The clamp post fully retracts into the instrument. This allows you to grab tightly packed cables.

testo 770 Clamp meters in comparison

The testo Current Meters – for current strength measurement

The advantages of the testo 770 Clamp Meter

  • Retractable slide clamp separates and grabs wires, without using your hands

  • Inrush (starting) current capture, APO (Auto Power Off), and Min / Max / Hold

  • Retractable post makes hook release fast and easy

testo 770 Clamp Meters in comparison

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Precise Clamp Meters for various applications

The pincer-like iron core allows targeted splitting of the busbars. This operating method enables you to measure the current even when you cannot switch off the system temporarily. Using a testo Clamp Meter makes it possible to record multiple values at once. These elements allow flexible use and ensure clear data collection.

When using testo Clamp Meters, two important points must be kept in mind:

  • only one single conductor can be grasped and measured,

  • if the clamp encloses an entire cable which contains both conductor and return conductor, only the leakage currents are measured.

Additional instrumention from Testo

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testo 760-3

Clever Digital Multimeters

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testo 750-3

Voltage Meter with 360° display

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testo 755-2

Current / Voltage Meters

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testo 745

Non-Contact Voltage Tester

testo 755 Current Probe – for even more precision

The Current Meter is an important measuring instrument for precision work in electronics. In contrast to the clamp meter, these diagnostic tools prove to be very sensitive, which means you can also measure extremely small currents with them.

High-quality, precise leakage current probes have additional functions, which for instance also test the starting current and measurement data in the μA range. Find a testo Digital Clamp Meter that suits all your requirements:

  • continuity and resistance testing,

  • voltage measurement,

  • RMS current measurement.

High-precision clamp meters from Testo – for greater safety

Testo's Clamp Meters stand out with an innovative retractable slide clamp which is easy to operate. This allows you to grasp the individual wires properly. This means it ensures reliable, contactless measurement of the values. Even when wires are tightly packed, you can be sure the Clamp Meter and Current Probe will work reliably. The testo Clamp Meter has a two-line display which is easy to read out and auto-selects current. You have the choice between the following models:

  • testo 770-1 with a fully retractable pincer arm for a high level of flexibility,

  • testo 770-2 with additional temperature adapter and measuring values in the μA range,

  • testo 770-3 with optimized TRMS method and Bluetooth connection.

For the recording of static magnetic fields

In order to be able to measure direct current, the clamp meter performs a resistance measurement that is dependent on the magnetic field. This enables static magnetic fields to be recorded, which is necessary because there are no alternating fields present with direct current. The magneto-resistive resistances which are required for this are fitted in a gap. Their really weak signal needs to be strengthened electronically, so the measuring instruments are equipped with an appropriate energy storage device and function via electric power or a battery. The testo Clamp Meters are also suitable for alternating current.

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