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

We have installed more than 10 of these on Fuel/Oil delivery trucks. These are mainly expensive new delivery trucks and we must stand behind them - so far no problems at all. We have supplied our own rectangular magnets to fit our purpose better: 1/8" x 1/4" x 1/2" that we install in an existing keyway, or we mill a 1/4" keyway into an accessible part, then epoxy in place. The sensor is installed in an existing part by drilling and tapping a 12mm x 1.0 thread (tap purchased from McMaster-Carr), or we fabricate a bracket and use the double nut method. The magnet must have North & South on the big flat side, and South must be out. We buy the magnets from K&J Magnetics (Part# B842), and they have a nice little iPhone and Android app available for identifying North and South. If the app gets confused, the magnet is probably not "pole"ed correctly. The wiring colors make it less than perfect for hooking it up, but the diagram included is correct. The tach reads 1 to 1: 1 magnet sensed = 1 full turn. No setup or programming required.

I wanted a direct readout of spindle speed on my metal lathe, and this little gauge/sensor fit the bill perfectly. It uses a magnetic sensor to detect a magnet attached to the shaft spinning past it. You need to tape, glue or otherwise affix the small disc magnet to the shaft you're monitoring, so make sure you attach it securely if your machine will be spinning at high RPMs. (It claims to measure speeds up to 9,999 rpm; I'd be a little nervous about the magnet flying off under those conditions. I don't know if you could use a stainless steel (non-magnetic) strap to attach it and still have the sensor "see" the magnet, but it wasn't a concern for my usage. Just a heads-up to others who might need to use it in a higher-rpm range. (Probably better to use a reflective vs magnetic sensor for high shaft speeds...)

I bought this for my Logan lathe. It works fine and everything was as advertised. The wiring diagram was correct and easy to follow. The unit requires 9-15 volts DC but it does not mention how much current the power supply has to supply. I first used a 9V battery with clip leads and it worked fine with the provided magnet. However with a 15V 200mA power supply, the magnet wasn't strong enough. So I ended up using a 9V 300mA power supply and it works fine. I just had to mount the magnet very close to the sensor. I used an ABS plastic sleeve with a counterbore and glued the magnet in. Then glued the sleeve to the spindle on my lathe. I was going to zip tie it on, but the zip tie interfered with the sensor.

I've been using this on my Smithy CB-1220 XL for about three months now, and am very pleased with it's performance. It certainly beats checking the belts to see how fast I'm going. The meter is designed to snap into a rectangular opening for an almost flush mount, but I didn't have enough clearance inside the gear box, so I whipped up a little case out of an old aluminum license plate. The circuit board is exposed from the back, anyway, and it probably would end up getting splattered with oil and chips if I had mounted it directly. I added a power switch on top, and used a surplus wall wart to supply it with 12 v. The magnet must pass very close to the sensor, and the only spot available was the face of the spindle pulley, so I mounted the sensor on a bracket that can easily be swung out of the way when I need to change a belt. I used epoxy to attach the magnet. The instructions were brief but to the point. I am considering getting another unit for my Shopsmith, if I can figure out where to put the sensor. A very good item!

I tried before installed this item. Worked fine. Installed on my drill press and stopped working after third time using press. I took it off and worked for an hour trying to diagnose and only got it to work intermittently on my bench. Ordered another. It did the same thing. Sent them both back.

I installed this tach inside the spindle gearbox of my lathe in 2017. It runs in oil, vibration, heat and general misery all the time. It was a simple install and very cost effective to try out, I didn't expect it to last very long. It is the end of April 2022 and this tach has never skipped a beat. Probably the best money I have ever spent for an electronic upgrade. I would recommend this product 100% of the time. It has been proven under the most severe conditions.

Used this for a one cylinder engine because it is difficult and expensive to find a good tach for a one cylinder. I have tried those inductive mini tachs that use a wire to wrap around the spark plug wire. They are not reliable and not worth installing. This works great. I installed on the end of the crank with a bolt and couple of washers. Grind a slot in the washers for the magnet and use a little epoxy extra security once you know you have the magnet installed with the correct side facing the pickup. I did have to fabricate a bracket to hold the pickup sensor ( not a big deal). It actually reads the rpm changes faster and more accurately than those little mini tachs. I am going to install another one on my other tractor this fall.

Installed this on my knee mill. I now can see the exact spindle speed. It was super easy to install and wire.

L image est un peu trompeuse , sur la photo on voit des chiffres bien rouge sur un fond bien noir , dans la realité c est plutot des cristaux liquides blancs , et l ecran est entierement recouvert d un plastique transparent rouge , tout va bien tant que le soleil ne tape pas dessus , car dans ce cas on voit beaucoup moins les chiffres , reste une tres bonne solution pour un tachymetre nocturne ( à condition de "l etancheifié" pour un usage moto ) le capteur , dans mon cas il ne sert à rien car c est un "effet hall" ( besoin d un aimant ) si c est pour une moto , et si vous avez une "petite cale metallique" sur le volant magnetique , preferez un capteur de proximité ( ce que j ai fait ) ( "coller" l aimant du capteur fourni sur une piece moteur ? oubliez ! ) en complement j ai acheté ces 2 capteurs : https://www.amazon.fr/gp/product/B005GCM7BC/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1 https://www.amazon.fr/gp/product/B0051T3BZ6/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1 ( attention à bien choisir un capteur NPN ( sens du branchement ) alors bien sur , ca demande de bricoler , il faut percer la ( tres grosse ) vis , qui sert à regarder le "point mort haut" , pour y inserer le capteur , ( un conseil : ne pas mettre un ecrou coté interieur car il peut se devisser et faire du degat , plutot ecrou et contre ecrou coté exterieur , et vous collez ( colle douce ) le capteur quand vous l enfilez dans cette grosse vis , apres avoir ajusté la distance bien sur ) j ai choisi les 2 capteurs qui ont la distance de detection la plus courte ( l un 2mm , et l autre 1,5mm ) car la "cale" a une epaisseur de 2mm justement , prendre capteur de minimum 150hz si vous voulez voir 9000tours/minutes , ceci dit l affichage ne peut pas depasser 9999 , donc ultra sportive passez votre chemin , vous hesitez entre les 2 capteurs ? prenez le 2eme , le PR08-1.5-DN ( fil plus long , 800hz , distance detection encore plus courte , meilleur sentiment de qualité ) conclusion , si vous etes bricoleur , si vous desirez un tachymetre "nocturne , si votre "conduite" ne depasse pas 9999tours/minute , si vous avez bien cette petite "cale" ( non aimentée ( j ai essayé )) sur le volant magnetique , si vous avez un petit budget , je vous le recommande , surtout que pour 17+9=26€ ( et en Premium ) il n y a pas d equivalent , quand on voit des tachymetres qui coute beaucoup plus cher et qui ne sont pas retroeclairés ...

ネオジュウム磁石は高速の回転体に取付けるので固定用のビス穴があるほうがいいですね！私は別途センター穴の開いた磁石を別途調達しました。 追伸：動作確認したところ表示器の数字が0のままで確認したところ写真の雲マークの4本足の素子が半田不良で外れてました。半田をやり直すと無事表示しました。

Exactly what was needed. Bought this particular one as it is very similar to what I already had which had stopped working.

As described

Einfacher Drehzahlmesser mit Hall-abnehmer. Der Magnet muss mit Zwei-Komponenten-Kleber oder mechanisch fixiert werden da er sonst bei höheren Drehzahlen >1500 U/min vom Rotator fliegt. Daher nicht gut für gewuchtete Rotatoren geeignet die mit hoher Drehzahl arbeiten. Der Magnet ist zwar leicht, mit Fixierung bringt er aber trotzdem eine neue Unwucht. Eine Berührungslose Reflexionslichtschranke als Geber wäre schöner. Die Drehzahlmessung wird im Sekundentakt aktualisiert und reicht für eine grobe Messung vollkommen aus. Das Kabel vom Sensor könnte etwas länger sein, ebenso vom Anschlusskabel. Einsatz bei mir an der Spindel einer Mini Fräsmaschine. Der Sensor verfügt über eine helle rötliche LED die konstant leuchtet und kurz flackert wenn der Magnet am Sensor vorbei kommt. Tut es das nicht, ist der Magnet falsch herum montiert. Dieser Hinweis fehlt leider in der sehr kurzen Dokumentation.