Lutron DW-6163 digital precision watt meter has professional 1 W resolution digital watt meter display, reliability, durability, direct operation, 6000W x 1W, ACV 600V x 0.1V, ACA 10A x 10mA, true power and wide range 0W to 6000W, true RMS measurement ACV/ ACA, super large LCD, dual display at same time, full function auto range, memory record, data hold, RS232/ USB computer interface, built-in low battery indicator, built-in backlight easy to readout, power DC 9V or AC to DC 9V adapter in.