... indicators, small counter2.Count-up, Count-down3.Counter, meter, 4.CEFeatures :1. two operate mode is optional: count-up; ... channel1 input channelOperation methodCount-up, Count-downOutput modeN, F, R, CReset / ZeroManually reset, Automatically delay reset, External switch ... (50/ 60Hz) SMPSPower dissipation≤ 5WWork conditionTemperature :-10~50°C Humidity ≤85% no caustic or magnetic field interference