The Klein Tools CL2000 True RMS, 400 Amp AC/DC Digital Clamp Meter is a great device for an electrician. The non-contact voltage measurement tool offers you the ability to store data for later use, and data is also protected from overload within the Klein CL2000. The built-in low battery indicator and automatic shut-off features help the Klein CL2000 to conserve energy when not inuse.