DIGITEN 4 Digital Green LED Tachometer RPM Speed Meter+Hall Proximity Switch Sensor NPN

Good product. Works well and appears very accurate

I’m very pleased with this...it’s been added to a metalworking lathe as attached photos. In order to keep things out of the way and clear of oil and swarf, the magnet is glued to the spinning knob at the rear of the headstock and the sensor is mounted in a wooden block underneath it, at an angle so that it’s roughly at right angles to the magnet face. The counter is also mounted at an angle in a wooden block, which allowed all the connections to be neatly inside. Both wooden blocks are held down with Velcro so that they can be removed and repositioned easily. Straightforward to fit...could be done simpler but I wanted it to be neat and out of the way. But it’s really good. I’m running mine off a 12v supply. A stronger magnet would allow the sensor to be placed further away...I did experiment but used the supplied one in the end because although I do have much stronger ones available, the supplied one did work at the required distance and it’s quite thin so doesn’t create much of a projection on the knob. I’m so pleased with this that I’ve just ordered another one as a spare! Recommended. Ps...as others have said, you need to get the magnet the right way up or it won’t work!

got this for my mini lathe and it works well, very good digital readout, but i had to put a stronger magnet on because the one that was supplied was not strong enough .

Easy to fit. As others have mentioned the magnet is small and must be placed the correct way around. I glued it with a small dab of superglue. My maximum speed is 2000rpm so not expecting problems. At the specified 2-3mm distance it works fine with no erroneous readings. I had a 12V supply already available on the equipment and this worked ok. The settling/refresh time at reaching zero speed seems excessively long- but maybe it waits for this time to see if another pulse is coming - allowing it to read to very low speeds. Once rotating the reading is stable and refreshes regularly. For the price this is good value. Cannot comment on reliability as only just fitted but it appears robust. The application will run for several hours/day most days so will know more soon - will comment back in a few months if disappointed.

Arrived on time and in excellent condition. The gap between the sensor and the magnet should be between 3-4 mm. This is proving to be a bit of an issue but will keep trying

This product is useless, I’ve had two of them, neither worked and had to be returned. Amazon refunded the money no problem. Avoid, they are a waste of time

Fitted to my new lathe at ~ £15, could not be better, quality is very good, works well and had easy to follow instructions. Longevity, unable to comment on, but hopefully will be ok. NOTE,, make sure you have the magnet right way up, if refers to this in the instructions.

Worked perfectly for two years, but then unfortunately the display blanked. To be fair, the enviroment was not ideal as it was fitted in a boat engine room with some vibration and voltage up to the max allowed of 15v. I did check the unit was still powered OK. I’ll replace it with a similar unit, but perhaps stabilise the voltage to 12v in the hope of increasing reliability.

中古の籾摺り機を購入しましたが、回転計が壊れたため、交換用に購入しました。 回転表示部は、ほぼ同じ大きさで四隅をやすりで少し削るだけで簡単に取付ができました。 センサー部は、配線が短く細いため、既存の配線と接続に手間取りましたが、何とか取付できました。

I bought this to show my lathe's speed. It worked well. A little problem mounting the magnet. Instructions say south pole. I used a magnetic navigational compass to determine north/south of the provided magnet. When I mounted south pole toward the sensor, it didn't work. Turned it around and it did. I epoxied the magnet so unmounting was a nuisance. Connection was simple, just be sure to follow instruction on wire colors. Ground yourself when handling electronics to keep static zero.

Ho acquistato questo contagiri per completare la mia fresa a controllo numerico. occorre fare attenzione ai collegamenti del sensore di hall perché se alimentato al contrario si brucia. Il magnete in dotazione non è particolarmente potente, volendo una distanza di misura di 5 o 6 millimetri ho usato al suo posto un N50 rettangolare 10x5 mm. Attenzione al fissaggio perché un magnetino da un grammo se messo in rotazione a 10000 giri produce una forza centrifuga di diverse centinaia di grammi e schizza via e può far male.

Dies ist schon der zweite Tacho, den ich in meine Maschinen eingebaut habe, lief alles bisher sehr gut.Die Spannung zur Versorgung ist so variabel, daß sie mit der Ausgangsspannung meiner 2 VFDs (Lenze und Parker) ohne Probleme betrieben werden kann. Der Anschluss ist denkbar simpel. Bei dem Sensor muss man nur drauf achten, daß der Magnet recht direkt am Sensor vorbeizieht (max 1mm). Ein stärkerer Neodyn-Magnet hat da bei der kleinen Maschine geholfen, auf der grösseren ist der Radius der Welle grösser, und man kann den Magneten besser positionieren. Ich wollte keine 4 Wochen warten, deswegen die deutsche Bestellung, 4 Tage sind OK, dafür gebe ich gerne etwas mehr aus.

Great product to add to your equipment like lathe or mill or drill.