... +/-19999, zero adjustment 2) 0.2%FS accuracy, RS485 ampere meter 3) CE, ISO certification 4 1/2 digital voltage ... meter & ampere meterDP4 serires Digital Panel Meter, Voltage Meter, Ampere Meter1) 8-bit micro processor, 5 ... signal, such as AC/DC voltage and current;3) With software menu and thumb switch to set High, Middle and Low ...