Testo 770 Series 400A True RMS AC/DC Digital Clamp Meter

The Testo 770 Series 400A True RMS Digital Clamp Meter is a professional-grade, versatile tool designed for accurate and reliable electrical diagnostics. Its true RMS (Root Mean Square) technology ensures precise measurements even on non-linear loads, making it essential for modern electrical systems. The clamp features a unique grab mechanism and a fully retractable pincer, allowing for easy and safe operation in tight, confined spaces where traditional meters struggle.

A key benefit is its automatic measurement parameter detection, which simplifies use by automatically identifying the correct measurement type, reducing the risk of user error. The large, backlit two-line display provides excellent visibility of readings in all lighting conditions. Beyond current measurement, this multifunction device includes a full suite of DMM (Digital Multimeter) capabilities for comprehensive circuit analysis.

Core Functions & Safety

The meter is rated to CAT III 1000V and CAT IV 600V, offering a high level of protection for working on electrical installations and distribution systems. It measures AC/DC current up to 400A and AC/DC voltage up to 600V. Additional functions include resistance measurement up to 40MΩ, capacitance, frequency, and diode and continuity testing with audible alert.

With automatic range selection and a 4-digit display, it delivers quick, accurate readings. Its robust construction and ergonomic design ensure durability and comfort during prolonged use. This clamp meter is an indispensable tool for electricians, HVAC technicians, and maintenance engineers requiring a reliable, all-in-one diagnostic instrument for fault-finding, installation verification, and safety checks.