... Meter measures and displays real time AC phase voltage, line voltage, and current with LED display in 3P3W ... phase current, voltage input, 4 bits display + one RS485,YD9122:3 phase current, voltage input, 4 bits display + one relay contact output,YD912A:3 phase current, voltage ... input, 4 bits display +one RS485 + one passive contact input + one relay ...