The Testo 770-3 (0590 7703 04) True-RMS AC/DC Clamp Meter is ideal for current and voltage measurements in tight heat pumps and mini split systems due to the compact design. The innovative grab mechanism and slide clamp jaw design ensures that grabbing the correct wire for testing is even safer given the tight spaces for testing thermistors and control panels. The movable pincer arm can be fully retracted into the instrument. This movable arm enables the instrument to grab tightly packed cables in an accurate way. Automatic measurement parameter recognition with the 770-3 ensures safe working conditions and eliminates the guess work when it comes to voltage measurements.

The rotary dial allows for the selection of more measurements such as resistance, continuity, diode, and capacitance, eliminating the need for multiple instruments to add to the bag. In addition, more specialized applications can be handled such as starting current, power, and microamp measurements. The 770-3 Clamp Meter automatically detects and selects AC/DC along with the other parameters for an easy and reliable operation. The Type-K Thermocouple Temperature Probe (not included) can be used to measure electrical parameters and temperature.

The Testo 770-3 (0590 7703 04) True-RMS AC/DC Clamp Meter features Bluetooth communication connectivity which allows the user to record measurements directly to various Testo brand instruments and the Testo Smart App. The calculation of output ratings combined with the Bluetooth interface increases the instrument's flexibility to collect more data at once in order to diagnose common problems of electrical connections. In the app, the user can display the measurement curve as a graph on their smartphone or tablet and then save or send readings directly in the report.

Due to the increased resolution, the 770-3 Clamp Meter delivers highly precise results even in the lower current range. The 770-3 also features an extended voltage measurement range of up to 1000 volts. The measurement values are clearly shown on the large two-line display of the 770-3 and within the Testo Smart App.