DUOYI DY294 Multifunction Digital Transistor AnalyzerTester1. It is mainly used for testing the DC parameters of manifold semiconductors such as diode, transistor, controlled silicon and field effect transistor. It also can be used to test the with stand voltage of capacitor, protection voltage of varistor and isolation of electrica. 2. Measuring forward voltage, reverse voltage, forward saturation voltage drop, amplification factor, reverse leakage current of various crystal diode, audion, silicon controlled