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Check the listing for details. LCD Tester DIY Kit Transistor Diode Capacitance ESR Meter Signal Generator. Condition: New. Listed at 27.29 USD. [For RTL-SDR Blog R820T2 RTL2832U TCXO SMA Software Defined Radio Dongle Adapter]. Automatically detects NPN and PNP transistors, FET, diodes, dual diode, thyristor, SCR, Automatic identification of the transistor pinout.