The Klein Tools CL150 True-RMS Flexible AC Clamp Meter, 3000 A is a current clamp that measures current from 0.01 to 3000 Amps. The flexible clamp enables measurements in areas that are difficult to access, allows access into panels and hard to reach areas (bundled wires, awkward conductors, and PLC cabinets). The automatically ranging true mean squared (TRMS) technology offers increased accuracy.