Inductive Proximity Switch

Description 

The LJ18A3-8-Z/BX NPN OPEN Inductive Sensor Probe is a normally open sensor that can detect the presence of metals at a range of up to 8mm, and is the ideal solution if you’ve been looking for an inexpensive way to add an automatic bed levelling system to your 3D printer. It operates on voltages between 6V and 36V DC, and can be connected to various controller boards.