Megger manufactures powerclamp and digital clampmeter, megger dcm1000p. The product is an advanced clampmeter that gives true rms readings of not only current and voltage, but of power quantities also. It measures ac and dc that is true rms, giving accurate results even with distorted waveforms. The powerclamp and digital clampmeter can measure power quantities. Powerclamp and digital clampmeter has a real-time bargraph display and built in digital output.