1.DUOYI DY294 Digital Transistor Parameter Tester Semiconductor transistor tester 2.paypal accepted 3.100% brand new DY294, the Digital Transistor DC Parameter Tester, is mainly used for testing the DC parameters of manifold semiconductors such as diode, transistor, controlled silicon and field effect transistor. DuoYI DY294 also can be used to test the withstand voltage of capacitor, protection ...