The ridgid cm 100 micro clamp meter is a true rms and auto ranging digital clamp meter with a large capacity and measuring range it can clamp around cables up to 30mm od and measure current up to 1000a acdc the clamp meter can also be used as a multimeter for 8 other functions and will provide clear and accurate readings on its large backlit lcd the slim and double moulded design provides easy one handed operation and can be conveniently used in confined cable compartments supplied with soft car