The BESANTEK BSTPM77 Power Meter, 100 - 240 VAC, 15A, 3750W measures voltage, current, watt, apparent power, frequency, power factor, power consumption and actual cost of power consumed measurement. This model may be used to monitor the efficiency of appliances and equipment, and can help reduce utility bills. The Optical USB to RS-232 data transmission feature enables download of results as well as real-time display on the PC.