Yosoo MK-328 Transistor Tester Capacitor ESR Inductance Resistor Meter LCR NPN PNP MOS Operates with ATmega328 microcontrollers. Displaying the results to a 128x64 graphic LCD-Display. One key operation with automatic power shutdown. Shutdown current is only about 20nA. Automatic detection of NPN and PNP bipolar transistors, N- and P-Channel MOSFETs, JFETs, diodes, double diodes, Thyristors and Triacs.