Portable Calibrators, Meter Test System,Portable Meter Tester,Power and Energy Reference Standards,Energy Meter ... will be turning to the computer analyzed with; 13, With wireless PDA, convenient operation and data management. Technical Data GF3121Measurement rangeEffective ... /60 Hz Dimensions 300mm×300mm×300mmHost quality 3.5Kg GF3121 wireless three-phase kWh meter site verification