... fluctuating site also can steadily calibration watt-hour meter error; 6, Divided into direct measurement and ... take barcode scanners to be automatic scanning electric energy meter, the table; 10, With intelligent photoelectric sampler, ... 0.05 º±0.05 ºPower constant 72000imp/kWh,7200imp/kWh,720imp/kWh*4Use of the environment -10~+55°C, ... 3.5Kg GF3121 wireless three-phase kWh meter site verification