At Masters Electronic you will find a large choice of Sensors to fill your Bill Of Material (BOM). Enjoy our Sensors Manufacturer Catalog, Price, Datasheet, Specifications, 2D & 3D CAD, Footprint allowing you to build your Electronic & Electrical projects. A sensor is a device that produces an output signal for the purpose of sensing of a physical phenomenon. In the broadest definition, a sensor is a device, module, machine, or subsystem that detects events or changes in its environment and sends the information to other electronics, frequently a computer processor. Sensors are always used with other electronics.