... calibration.♦Energy Record: It can store energy in billing day of each month. The billing day ... PC or HHU. ♦Battery: It is equipped with build-in lithium battery, which could be used for a ... components.Technical Parameters Accuracy ClassClass 1.0,Rated Voltage(V)110,120,220,230,240,etc. ... start proof logical design, voltage reversal add rated voltage 115%, when no current is in circuit, meter will output ...