For tinyfab cpu only . This plugs in to the x-axis endstop and swapping the x-axis end stop to the door check port on the cetus main board. The doorcheck port is not populated (cetus mk1/2) so you will need to solder a connector to the mainboard yourself.
 
https://www.tinyfab.xyz/single-post/2018/07/12/Wonky-print-bed-No-problem-with-auto-bed-leveling

Contents
1x 5v 12mm NPN normally open inductive sensor.
1x xJST XH 3pin connector
 
Sensor mount for printing
https://www.thingiverse.com/thing:3001088