Slim DIN Rail Mount NPN to PNP/PNP to NPN Sensor Logic Signal Converter Module: Amazon.com: Industrial & Scientific
Transistor Kit 10 Value 200pcs NPN PNP Power Transistor Assortment Kit, Transistors Box Pack for BC337, BC327, 2N2222, 2N907, 2N3904, 2N3906, S8050, S8550, A1015, C1815 by Kulannder: Amazon.com: Industrial & Scientific
Amazon.com: PNP NPN Transistors Kit, Three Pins Silicon Power Transistor Assorted Assortment Box Set Range 2N3904-MPS2907, 10Value,Pack of 200, by Ltvystore : Industrial & Scientific
Multifunction Meter DIY kit, ACEIRMC Mega 328 Graphic Transistor Tester, NPN PNP Diodes Triode Capacitor ESR SCR MOSFET Resistor Inductance LCD Display Checker with case: Amazon.com: Industrial & Scientific
600Pcs 15 Kinds of Values X 40 Pcs NPN PNP Transistor TO-92 Kit Set with Plastic Box: Amazon.com: Industrial & Scientific