Beijing Beiyanxing Electric Power Instruments Co., Ltd. exports single-phase/three-phase standard electrical energy meter, single-phase/three-phase electrical energy meter on-site verification equipment, single-phase/three-phase electrical energy meter testing equipment, three-phase precise stable power source, digital panel meter, etc. company passed ISO-9001 quality management system audit presided by the famous European authentication company-SGS at one time in 2001.