... from RS485 3. Multif-tariff, demand PMAC903 Three Phase Digital Electronic kWh Meter Features:1. Suit for 220V AC low voltage ... . Spring type buckle, easy to install PMAC903 Three Phase Digital Electronic kWh Meter Basic Function 1. Measure and display kWh value2 ... V, I, P, Q, S, PF, F PMAC903 Three Phase Digital Electronic kWh Meter Optional Function 1. Multi-tariff2. Reactive energy measuring3 ...