The Testo 770-3 is a professional TRMS clamp meter for HVAC/R electrical diagnostics. Features non-contact voltage detection, AC/DC current to 600A, AC/DC voltage, resistance, diode/continuity, and temperature via K-type thermocouple. Bluetooth connects to testo Smart App for wireless data logging. Grab mechanism for easy one-hand operation on tightly-packed cables. IP42 protection.