ITEM NAME:3.5inch Colorful Graphic Display Multifunction Transistor Tester Diodes LCR R6P4 Description&Preview.It can be widely used to detect NPN and PNP transistor, capacitor, resistor, diode, triode, N-channel and P-channel MOSFET, IGBT, JFET, triac and battery etc. Zener Diode:Transistor Detect Area: 0.01-4.5V.