The IT9121E power meters feature built-in GPIB/RS-232/USB/LAN interfaces without extra purchases, saving costs. The IT9100 power meter also offers a voltage range of 0 to 600V and a current range of 0 to 20A. For current measurements above 20A, a voltage input type current clamp or current sensor can be used. The IT9100 allows the user to select from 50mV to 2V (EX1) or 2.5V to 10V (EXT2) ranges.