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Check the listing for details. DIY Kit Tester Transistor Diode Capacitance ESR Meter Signal Generator Tool. Condition: New. Listed at 16.70 USD. Mini USB2.0 EDR Wireless Bluetooth Dongle Adapter For Laptop PC Win Xp Win7 8. Automatically detects NPN and PNP transistors, FET, diodes, dual diode, thyristor, SCR, Automatic identification of the transistor pinout.