With a permit for testing the power facilities of category V and high-end power system measurement standards and technologies such as 0.01 precise voltage transformer, 0.01S current transformer, 0.05 three-phase watt-hour meter calibration device, 0.001 multifunctional standard source, 26.5G signal generator, 40G frequency meter and optical fiber parameters (optical power, optical attenuation and optical wavelength), we (Guangzhou GRG Metrology & Test Co., Ltd.) can provide professional technical services such as Instrument and device measurement and calibration, power safety appliance and tool inspections, power equipment testing for grids, power plants and power equipment manufacturers.