panel meter,voltmeter,digital panel meter 1.OEM 2,High quality,reasonable price,hot sale Detailed Product Descriptionpanel meter,voltmeter,power meter 1.OEM 2, ... as AC,DC,Voltage,power synchronous volume,frequency,expended voltage and overload current etc.The product performance is accordance with GB7676-98standard. ... 500V 600V,More than 600 external connect secondary grade100V voltage transformer