... 1.OEM 2,High quality,reasonable price,hot sale frequency panel meter,smart meter,panel meterThe scope of applicationThe ... of various control system and distribution system to indicate relative parameter,such as AC,DC,Voltage,power synchronous volume,frequency,expended voltage ... :-20~+50°C;Relative humidity:≤85%;Resistance to pressure:when self-frequency constant value various is ±15%,The error of ...