... 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,hour meter ... 8. Operating environment: Temperature: 10~50 C degree humidity: ≤85% 9. Storage environment: ... Temperature: -30~60 C degree, humidity: ≤70% 10. Heat ...