The M12 Proximity Switch Sensor (LJ12A3-2-Z/BX) is a cylindrical inductive sensor designed for detecting metallic objects within a 2mm range. It operates on a DC 6-36V power supply, delivering a 200mA current output, and features an NPN Normally Open (NO) three-wire configuration (brown: positive, blue: negative, black: signal). With a 12mm diameter, it’s commonly used in industrial automation, such as 3D printers and CNC machines, for precise metal detection. The sensor has a response frequency of 0.5KHz, works in temperatures from -25°C to +55°C, and includes a 1.2m cable. It’s praised for reliability and easy installation but criticized for occasional electrical noise issues if not properly isolated.