... digital panel meter,panel meter,energy meter,ampere meter,volt meter,freqency meter,power meter,power factor meter,hour meter, m digital panel meter,panel meter,energy meter,ampere meter,volt meter,freqency meter,power meter,power factor meter ... consumption: <0.3VA 8. Operating environment: Temperature: 10~50 C degree humidity: ... ≤85% 9. Storage environment: Temperature: -30~60 C degree, ...