The ACDC6 is a high-current AC / DC Current Clamp Accessory that gives technicians more flexibility when testing line current. Measures up to 600A AC or DC. The clamp enables most multimeters to measure current without breaking the circuit. The jaw opens to 1.18 inches (3 cm). A coiled cable keeps clutter out of the testing area, Quickly zero out the clamp using the adjustable dial on the face. Use with any multimeter with industry standard Volt and COM jacks and mV AC and DC ranges. Green mechanical contractors tell us they are also using the clamp to measure high-current lines on integrated solar panel powered HVAC / hot water systems.