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Check the listing for details. 1Set Tester Transistor Diode Capacitance ESR Meter Signal Generator Tool DIY Kit. Condition: New. Listed at 21.04 USD. Automatically detects NPN and PNP transistors, FET, diodes, dual diode, thyristor, SCR, Automatic identification of the transistor pinout. Main chip is the DIP, easy for electronic enthusiasts to DIY or update the main chip.