WESPC Original GV57 MK2 Digital Meter 3-Phase Voltage Current Frequency Model Number GV57 MK2 Consuming power MAX:3 W Working condition -25-70℃ Storage condition -40-85℃ Panel cutout 91mm*91mm Weight 0.32kg Summary GV57 MK2 is a voltage and current detection instrument for three-phase generator. Five high brightness LED displays relevant parameters. RS485 communication port can be selected to read more parameters. The system parameters can be set according to the key, so as