... voltage of varistor and isolation of electrical. Meanwhile DuoYI DY294 can test 78 and 79 series three-terminal voltage ... Measuring rated working voltage of chemical capacitor,terylene capacitor,DuoYI DY294 Ta capacitor,Leaded multilayer ceramic capacitor,high voltage lacker ... . Measuring protection voltage of varistor. DuoYI DY294 Measuring starting voltage of neon bulb, neon lamp. ...