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Relay, MRI-24TR/INV NPN PNP Signal Converter PLC Sensor Polar IO Level Conversion Module USB Relay Board PNP to NPN Signal Converter: Amazon.com
Amazon.com: Non Contact Liquid Level Sensor Contactless Water Tank Water Level Sensor for Tank Water Level Control PNP/NPN(XKC-Y26-NPN) : Industrial & Scientific
Basic In Circuit Transistor Tester NPN/PNP 2 x LED [ Unassembled kit ] - - Amazon.com
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