Mini Power Meter ,Power Meter,meter, This power meter can indicate working voltage, power, electrical quantity, ... 60 minutes, 0~24 hours, 0~999 daysRefresh Frequency over two times per secondMeasurement Accuracy first classDisplay Mode ... time) LCD screen, plus 4 decimalsCompression of power frequency AC220v power supply,input /output time ≥AC2kV/min. ... °C Humidity 10~95% RH Mini Power Meter HD-D02A-O