This proximity switch is commonly used in robotics and security systems. This switch closes the electrical circuit when an object gets near. Proximity switches of different configurations are available.
Reed switch used: MKA14103 AT1015.
Wire used: UL1007 24AWG black.
Housing length: around 23mm.
Sensor body material: ABS with epoxy filling.
Max. initial contact resistance (does not include the wire): 100mOhm.