KKmoon 128*64 yellow-green LCD Backlight ESR Meter LCR led Transistor Tester Diode Triode Capacitance MOS PNP/NPN One-button operation, automatic shutdown. Powered by 9V layer-built battery, can use 2 li-ion batteries to form a 8.4V battery pack for long time power. Measuring bipolar transistor current amplification factor and base-emitter threshold voltage. Automatic test the pin of a component, and display on the 128 * 64 LCD backlight. Automatic detection of NPN and PNP transistors, n-channel and p-channel MOSFET, diode (including double diode), thyristor, transistor, resistor and capacitor and other components.