The Testo 770-1 TRMS Clamp Meter is expertly designed for non-contact current measurement on tightly packed power cables or conductors with a small diameter. Its unique grab mechanism allows you to easily and safely isolate each individual cable, making it an ideal tool for current measurement in switching cabinets. Key Features Unique Grab Mechanism: Fully retractable pincer arm enables easy and safe grabbing of cables in tight spaces. Automatic Parameter Detection: Automatically detects and selects measurement parameters such as direct and alternating current, resistance, continuity, diode, and capacitance.