DIGITEN 4 Digital Green LED Tachometer RPM Speed Meter + Hall Proximity Switch Magnet Sensor NPN + Sensor Mounting Holder for Lathe Conveyor Belt

Straight forward to power and wire up. Provides reliable RPM to my machine tools.

Installed this yesterday on my PM-1340GT lathe. Works. Would recommend.

It worked as expected as a tachometer for my wood lathe.1) A wiring diagram is provided but there are many YouTube vids available if you have problems. A power supply (not provided) and the sensor need to be soldered or joined as no connector is provided.2) It comes as 2 circuit boards mounted in a bezel so the rear is exposed and you may want to add a case.3) As stated in the description it takes 10-20 seconds to show 0 RPM after rotation ends and no provision how to adjust it shorter.4) I am not sure it reads the true RPM - it is consistently ~12% lower than my lathe though on 2 induction motors (a grinder and a pump) it reads within 10-15 RPM of the motors' specs. Probably a 'Close Is Good Enough' for the lathe's RPM setting and within range of induction motors' specs.Conclusion: Not perfect but a great bargain for the price - I'd recommend this product and buy it again.

THANKS

Easy to use. Just be sure to get the magnet in the right way. I had to use a 15v power supply as it wouldn't start with a 12v one. An old cordless phone power supply did the job.

The media could not be loaded. I bought this to install on my drill press and it’s an excellent addition. I mounted the sensor to the underside of the top body and JB weld the magnet to the pulley. It’s very accurate and the screen is bright and easy to read.

Seems like it would be a great tachometer, but even after spending 90 bucks to get my lathe drilled so I could recess the magnet into the shaft, I never could get it to read properly.

This unit (or one of the other colors) is my go-to standard part for adding RPM meter to old shop tools.