Yosoo Transistor Tester DIY Kit M328 LCD 12864 Diode Triode Capacitance LCR ESR Meter Can be powered by 9V battery(not included) Automatically detect NPN and PNP transistors, N-channel and P-channel MOSFET, JFETs, diodes, inducto Automatically test the pins of a component and show on the display Short detection time: only 2 seconds. It costs more time for bulk capacitor detection. Can be used as signal generator and frequency meter. Different built-in square signals from 1Hz-2Mhz