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Check the listing for details. LCD Dislay Tester Transistor Diode Capacitance ESR Meter Signal Generator DIY. Condition: New. Listed at 20.52 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.