PGFUN CNC 3D Touch Probe Upgraded XYZ Axis Anti-roll Edge Finder Waterproof 3 Coordinate Measuring Sensor Kit with 6mm Shank & 6.5 Ft Cable, Compatible with Mach3 and Grbl (Edge Finder-NO)

Don't throw out the paper receipt as its the instructions telling you what color wire is which. Note requires a 5v to 24v power source for the red cable, Black is Ground and Yellow is Signal. Same setup as any powered proximity switch you have to source at least a 5 volt power source for the red cable. Those people that righteously say its a three pin plug (Note you do have to provide your own) without offering jumpering it to a 5 volt pin are not helpful. Very good value as unlike an Aluminum touch plate this is insulated from the machine so if like me you have an aluminum bed this will still be able to align your machine. They also threw in a freebie which I used to test the wires a little wire clamp kit.

I ordered the NC version and it is stuck in the closed position. I have tried continuity and ohms testing, it will not switch to the open position. The light work as the should when compared to a functioning NO unit. Either the unit was not programed correctly or has faulty circuits. Glad I tested it before using. I will give the seller a chance to fix or replace the faulty unit before returning it to Amazon.4/21/23: seller has shipped a replacement. Fingers crossed that it works.

Their definition of NO / NC seems backwards to me. It seems like NO should be 0V at rest but it's not. Instead, at rest the yellow lead is high (12V or whatever your power supply is) and it goes low when triggered by an edge.Fortunately my CNC control has both a normal and an inverted probe input so I didn't have to exchange this. This NO probe would not work in this control's edge finder port as it requires trigger=high.Once wired correctly the probe works very well. I checked runout after placing in a standard ER20 Tormach TS tool holder and TIR of the probe tip was 0.0005 out of the box before making any adjustments.

So far so good. Accuracy and repeatability is good enough for the hobby machine that I'm using this on.

This exceeded my expectations. Ive boughten some other ones in the past. This is very well machined. Works very well for the precision i need. It has 4 set screws that let you adjust the concentricity unlike other cheaper ones.I would definitely recommend this seller and this product. We’ll just see if it stands the test of time now.