Digital LED Tachometer, Icstation RPM Speed Meter AC 110V 220V Digital Motor Tachometer with Hall Proximity Switch Sensor NPN for Lathes, Conveyor Belts, Quality Inspection Machines

I have a Shopsmith Mark 5 machine. I primarily use the drill press function these days. It has a variable speed dial labeled with letters rather than actual RPM, so I was looking to add a digital speed readout. This tachometer is reasonably priced and looked like it would do the job.The package arrived quickly and was easy to assemble, but required soldering three wires to connect the hall sensor to the three-pin connector. I wired up a 110 power cord and attached the magnet to the power take-off shaft, held the hall effect sensor close to the shaft and the RPM was immediately displayed. I also attached the magnet to the side of the chuck and the sensor still read the RPM.I will need to fashion a bracket to permanently mount the Hall sensor and the electronics. In summary, it works great.

worked well but the magnet picked up shavings swiched to prox.Taiss 2pcs LJ12A3-4-Z/AX Proximity Switch Inductive Proximity Sensor worked with it no magnet

Put this on my lathe to monitor speed since the lathe only had a printed dial. I did compare this to another device and it was off by 10 rpm at 1000 rpm speed. For this purpose, more than accurate enough. You will have to figure out how to mount the sensor, and how to mount the unit in a box or panel. Uses 120VAC so do not use it without it being enclosed. Mounting will require some tool capability, but otherwise it is brain dead easy to wire up. More that great for the price!

Added two to the 3in1 I picked up used because it didn't have the speed chart for belt arrangement, so these help alot they're really consistent with the results and are easy to install

I saw this tachometer design in a machinist video. I liked that it uses mains input, in my US location this is 120V but the input can be 240V. The board converts this to whatever DC voltage is needed for the Hall effect sensor and display.I installed the supplied magnet in a balancing hole that was machined into the underside of my quill pulley. A piece of thin scrap wood holds the Hall effect sensor.I could have made a box out of thin plywood, but instead I designed a box and lid in a CAD program and then 3D printed the box and lid. Makes for a nice installation.It takes a few rotations for the sensor to stabilize, but then the display shows a stable reading.I would buy this again.

It worked fine the first time I used it. The second time I powered it up, it would not count. It just displays HHHH all the time. Tried different speeds, checked all wiring. Will not work now.

The product was priced right and looks like it would be a good choice for checking the rpm of a piece of machinery. It is fairly intuitive on how it should be wired but there were no directions included... no specifications for the distance the pickup should be from the magnet, or that the magnet polarity is important for the unit to work. I learn this information from You tube. My unit powered up but didn't read the RPM and just blinked "HHHH" on the read out. I sent it back for a replacement and I am waiting to see if the next unit will work. The good thing is that Amazon has a great return policy.

Works awesome on my mill.Response is a little slow but it's good for my application.