Automatic detection of NPN and PNP bipolar transistors, N- and P-Channel MOSFETs, JFETs, diodes, double diodes,N- and P-IGBTs, Thyristors and Triacs. For Thyristors and Triacs the ignition current and holding current must be reached with the tester. For IGBTs the 5V signal should be enough for driving the gate voltage.