Taiss 2pcs LJ12A3-4-Z/AX Inductive Proximity Sensor Detection Switch NPN NC DC 6V-36V 4mm Normally Close Proximity Switch 6-36V Approach

using it as a Z probe on my ender 3. the description says "6v-36v" but it works fine off 5v.according to the deviation test this probe has 0.001mm deviation

This ships as a single unit not 2 as described. It is also a NO switch not NC as shown in the descriptiom

Worked well for my application. I'm using small pieces of brass so the 4MM range is shortened.

Used on a DIY annealer machine. Exactly what I needed. Comes with 2 sensors in the pack (I didn't realize this until it arrived...guess I should have read the description better).

Using for CNC end stops but they constantly trigger. An RC filter or twisted and shielded wire is absolutely required.