Measuring single-phase current, voltage, active power, reactive power, power factor, frequency etc. ... -RTU protocol; baud rate 2400/4800/9600/19200bpsRelay outputRelay contact capacity: AC5A/250V resistive, DC5A/30V resistiveOn-off inputR<500Ω on ... ; Altitude ≤ 2500M.Storage condition-20~75°C; Relative humidity < 93% Single-phase digital Voltmeter