Feature:1. The sampling of the electric energy meter can measure the electrical parameters, such as current, voltage and frequency of the power grid and the setting ratio through the keys on the panel.2. High reliability and long service life,the mean time between failures are more than 50000 hours.3. Can work normally at -10~55 and at humidity less than 93%rh without dew and corrosive gas.4. Equipped with a LED screen to display parameter with a range of -1999~1999.5. High insulation resistance voltage which is more than 100MOhm.Specification:Item Type: MeterVoltage :450VAC 5AOverload:Current:Continuously 1.2 times in a second,instantly 10 times in a second.Voltage:Continuously 1.2 times in a second,instantly 2 times in a second.Frequency:45~65HzAccuracy Level:0.5Display:LED Range from -1999~1999Power Voltage:AC220VConsumption:<5VAInsulation Resistance:>=100MohmIsolation Voltage: 2kV/1min (Rms) Between Power/Input/OutputMean Time Between Failures: 50000hTemperature: Work -10 ~ 55 C, Storage -25 ~ +70 CHumidity: 93%Rh, No Dew, No Corrosive GasAltitude: 2000mProgramming Instructions:There are three buttons on the meter, such as ''Settings'', '''', '''', ''''.'''':Left shift key for function selection.'''': Confirm button for changing the digital position for digital input.''set'': Main menu button for moving the menu backwards or ignoring the operation.'''': Enter the confirmation button to enter the next menu or confirm the operation.Package List:1 x Meter1 x Users ManualNote:After the setting is completed, right click the ''Set'' button until ''Save'' is displayed, then press '''' to confirm the save.