... .OEM 2,High quality,reasonable price,hot sale single phase AC current meter,ac ammeter,meterThe scope of applicationThe series product is ... various control system and distribution system to indicate relative parameter,such as AC,DC,Voltage,power synchronous volume,frequency, ... 5;Service condition:-20~+50°C;Relative humidity:≤85%;Resistance to pressure:when self-frequency constant value various is ± ...