Dongying Orientsun co.,ltd is a professional company which specializes in developing and manufacturing ground control equipment and testing instrument for oil well. Our products have been approved by ISO9001:2000 and China Classification Society(CCS),Our main products including Variable Speed Drive for Electric Submersible Pump ,soft-start switchboard for ESP,VSD for Pumping Unit, Portable Power Testing Instrument for Oil Well, Echometer ??ynamometer System and so on. Anticipating your inquiry and the opportunity to cooperate with you!