Dranetz-BMI 8800 PowerScope: Simultaneously monitors voltage, current and environment for all three-phase power disturbances This 8-channel instrument measures three-phase voltage and current simultaneously, making it easy to determine the source of a power quality disturbance. It has 8 additional channels for environmental measurements like temperature, temperature rate-of-change, RFI, and humidity. Or you can use the additional channels to monitor AC or DC voltages.