... High Voltage Electric Co.,Ltd,is a professional OEM/ODM manufacturer about switchgear conponents,such as voltage indicator,heater,short ... comparator VDS-CA is used with VDS1-T series of test socket to indicate electrified status and check phase sequence of ... so forth.3.Providing perfect service for customers Quality control 1.100% inspected before packing and shipping2.with QC report test socket VDS