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
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