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

4.2 4.2 out of 5 stars 490 ratings

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Purchase options and add-ons

  • Measure range: 5-9999RPM.
  • Power requirement:DC 8-15V
  • Come with hall sensor and magnet
  • Display: Green 0.56" LED
  • Application: Lathe, CNC, Mower, Spring, etc.Measure varied motor RPM.
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Product Description

Specification
Power requirement: DC 8-15V
Measure range : 5-9999RPM.
Clear zero: Automatic.
Clear zero time: about 10s. The greater RPM value, the longer clear zero time.
Refresh frequency: 0.2-0.5S@120-1200RPM;0.25-0.06S@2400-9999RPM.
Measure accuracy: RPM<5000,±2;RPM>5000,±3.
Display: Green 0.56 inch LED
Sign: Pusle signal,Hall NPN 3 wires normally closed.
Hall proximity model: NJK-5002D
Appearance: M12mm cylinder.
Detection range: 2-3mm
Proximity output current: 200mA
Detected objects: magnet
Response frequency: 100HZ
Tachometer dimension:72x36x20mm,panel cutout Dimension:68x33mm.
Sensor dimention: M12x37mm.
Sensor wiring: brown--Power+; blue--Power-; black--signal.
Operating temperature: 0 to 50°C.

Package includes

Tachometer x 1
Hall NPN proximity sensor x 1
Magnet x 1

Tips:
1.Please confirm that all the wires are connected correctly.
2. The direction of the magnet must be correct. If it is not correct, please flip the magnet.
3.The distance between the magnet and the sensor must be kept at 2-3mm (0.07"-0.12").

If you have any other questions, please feel free to contact us by email, we will definitely solve the problem for you.

Product information

Technical Details

Additional Information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
Product Warranty: For warranty information about this product, please click here

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


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Customer reviews

4.2 out of 5 stars
4.2 out of 5
490 global ratings

Customers say

Customers like the performance, ease of installation, quality and value of the tachometer. They mention that it works well, the instructions are easy to follow and that it's well made. They appreciate the rpm, saying that it is accurate and uniform over the speed range.

AI-generated from the text of customer reviews

65 customers mention50 positive15 negative

Customers like the performance of the auto accessory. They say it works well, is easy to use, and has a green display that works well in any light. Some mention that the brackets required were well worth the effort. Overall, most are satisfied with the performance and functionality of the product.

"Works better than expected...." Read more

"Got this to add to my wood lathe, works great!..." Read more

"Very good, works as expected. Easy installation" Read more

"this item worked well when it worked....i found i had to get a bigger heavier neodymium magnet so that the sensor could be mounted an extra 1/4 inch..." Read more

25 customers mention25 positive0 negative

Customers find the installation of the auto accessory to be simple. They mention that the instructions are super easy to follow, and the wiring diagram is simple. Some say that the product is easy to set up and works well for their application. Overall, most are satisfied with the ease of installation.

"...Pretty neat setup, works well...." Read more

"The tachometer is well made and easy to install in the machine that I am building. Great value for the price." Read more

"...I bought that at Dollar Tree for you guessed it, a dollar. The wiring diagram is simple and I used tiny wire nuts I may later solder the connections..." Read more

"Very good, works as expected. Easy installation" Read more

21 customers mention16 positive5 negative

Customers like the quality of the auto accessory. They say it's well made, accurate, and reliable. Some mention that the magnet is pretty strong and stays where they put it. Overall, most are satisfied with the quality and functionality of the product.

"The tachometer is well made and easy to install in the machine that I am building. Great value for the price." Read more

"...In summary, this is a well made and nicely constructed tachometer for the price!" Read more

"Very good, works as expected. Easy installation" Read more

"...Oddly it is a different component on each. Just total junk...." Read more

19 customers mention19 positive0 negative

Customers are satisfied with the value of the auto accessory. They mention it's a great product for the price, easy to use, and high quality. Some say that it'll be a good buy.

"...Great value for the price." Read more

"...In summary, this is a well made and nicely constructed tachometer for the price!" Read more

"...Great value!" Read more

"...Very pleased. Good deal for the money and was a fun little project for my mill!" Read more

12 customers mention9 positive3 negative

Customers like the rpm. They say it's better than guessing speeds, accurate, and uniform over speed range. They also say it adds a speed display to your equipment, and works perfectly. Customers also mention that it updates quickly when running.

"...tested the accuracy and as far as I can tell is accurate and uniform over speed range...." Read more

"...Accuracy appears to be excellent; no fluctuations when the speed is set I couldn't be happier with this tach. Great value!" Read more

"...for some reason it worked and was very accurate but now it decided to read double the rpm it seems?..." Read more

"...Works perfectly and updates quickly when running, but not so quickly that you get a blur of changing numbers on the readout—maybe a little quicker..." Read more

6 customers mention6 positive0 negative

Customers like the accuracy of the auto accessory. They mention it's pretty basic, but accurate and visible.

"...Oh, forgot to say I tested the accuracy and as far as I can tell is accurate and uniform over speed range...." Read more

"...Directions were as clear as could be. Accuracy appears to be excellent; no fluctuations when the speed is set I couldn't be happier with this tach...." Read more

"...this installed on a small engine for some reason it worked and was very accurate but now it decided to read double the rpm it seems?..." Read more

"...It seems accurate based on an online calculator with RPM and pulley size inputs. If this one ever goes belly up, I'd buy it again." Read more

6 customers mention0 positive6 negative

Customers are dissatisfied with the display of the auto accessory. They say that it goes out, shows zero, and quits displaying all together. Some customers also mention that the display has a couple dead segments.

"...While driving tractor it stated working. Next day same thing, no display (it normally would display a 0 before starting engine then giving rpms)...." Read more

"...Fist display had a couple dead segments. Vender was quixk to respond and sent a new display. Works great." Read more

"...stopped working first by giving eroniuse readings then just quit displaying all together." Read more

"the tachometer worked halfway through the first cut then the screen went blank and never came back on so as long as I don't touch my throttle I..." Read more

6 customers mention0 positive6 negative

Customers are dissatisfied with the magnet included with the auto accessory. They mention that it works well, but the included magnet did not work for them. The magnets are unmarked, so it's up to you to do the testing. Some customers also mention that the only thing they found a problem with was mounting the trigger magnet, which is likely due to the very close spacing of sensor to magnet.

"...This is likely due to the very close spacing of sensor to magnet in my particular case.I will purchase again for additional builds!" Read more

"...I did have a durr moment tho. The magnet will only produce a signal for the display from one side of the magnet...." Read more

"...Works well other than as several users commented, the magnet won't hold at high rpm (around 600 on our application)...." Read more

"It works well, but the included magnet did not work for me, and I made the distance between sensor and magnet as tight as possible...." Read more

Great Little Tachometer!!
5 Stars
Great Little Tachometer!!
Hello All! I purchased this tachometer to provide RPM information on my drill press. After reading several reviews, I thought I would do some additional measurements of the sensor for others to use in their decision making and engineering efforts. As the sensor is a hall effect device, the magnetic polarity of the supplied magnet in relationship to the sensor DOES matter. It is essential that the SOUTH pole of the magnet face the sensor. In order to determine which side of the magnet is the south pole, I used a smart phone app provided by K&J Magnetics called KJ Pole ID (iPhone version). Simply open the app and point the top of the phone towards one face of the magnet. The app will display the magnetic polarity that is currently facing the phone. Arrange the magnet such that the app displays "The SOUTH pole of the magnet is facing the phone", then mark the face of the magnet for easy identification prior to mounting.When power to the sensor is ON and no magnet is present, the sensor will output 0VDC as shown in the picture. The red LED on the bottom of the sensor will also be illuminated. When the magnetic SOUTH pole of the magnet approaches the sensor (in my test, about a quarter inch), the red LED will turn off and the output of the sensor will switch to a positive DC voltage. In my test, this voltage is proportional to the supplied DC input voltage to the sensor minus approximately 560mV (Vout_sensor = Vdc_sensor - .560).The rise time of the sensor, or the time it takes for the output of the sensor to rise from 10 percent to 90 percent of its steady value (Vout_sensor), is 114uS. This is with a 9VDC regulated DC power supply into the sensor. Please see the attached photo for additional details. The fall time (no photo attached), is much faster with a time of 160nS.During the wiring portion of the assembly, it's important to note the colorings of the wires at the display and at the sensor.The sensor color codes are as follows:Brown: +DC supply voltageBlue: GNDBlack: Sensor Output Voltage (I called this Vout_sensor in my discussion above)The tachometer display color codes are as follows:Red: +DC supply voltageBlack: GNDYellow: Sensor Input Voltage (Connect this lead to the Black lead of the sensor wiring)As mentioned by Digiten, the DC supply voltage must fall into the range of 8VDC to 15VDC (Do NOT use an AC-output power supply). As an engineer, this implies that any supply voltage below or above this range can cause unexpected operation or failure of the product. My recommendation is to use a walwart-style (plug in) regulated DC power supply with an output voltage of either 9VDC or 12VDC. When connecting the power supply to the tachometer, make certain that the output polarity of the power supply correlates to the input polarity of the tachometer.When mounting your display, I would recommend measuring the actual dimensions of your display first as mine were slightly different from the recommended cutout dimensions shown on the product page. The cutout portion of my display (the area behind the front mounting flange) measured 33.33mm by 68.26mm. The panel cutout dimension on the page has this listed at: 68x33mm. Those extra thousandths of an inch could make mounting the display a challenge depending on the supporting material.In my next review, I will compare the RPM values from this tachometer to the RPM values calculated from a high-end encoder and RPM measuring device :) In summary, this is a well made and nicely constructed tachometer for the price!
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Top reviews from the United States

Reviewed in the United States on February 8, 2024
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5.0 out of 5 stars Works better than expected, only time will tell if it continues that way.
Reviewed in the United States on February 8, 2024
Works better than expected. I installed on a 6-speed gear driven milling machine spindle and the RPM shown is within 3 rpm of what the machine manufacturer says it would run at any particular speed. The included magnet is holding fine at 1500 rpm, but I will likely epoxy it on just in case. This is polarity specific so if you get no reading try flipping the magnet over.
Hopefully it keeps working long term, only time will tell.
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One person found this helpful
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Reviewed in the United States on October 10, 2022
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5.0 out of 5 stars Great addition to wood lathe
Reviewed in the United States on October 10, 2022
Got this to add to my wood lathe, works great! I knocked off 1 star for ease of installation because I had to do a fair amount of fiddling to get it all installed. Got a single-gang plastic electrical box and a blank cover. To fit the display I had to cut out & file a hole in the blank cover. Then glued the included magnet to the spindle pulley, made a small bracket to mount the pickup transducer and used a 12VDC adapter I had to power it all. Also wired in a duplex outlet on the lathe so that when lathe is turned on the tach display also turns on.
Pretty neat setup, works well. I haven't tested the accuracy of the display because it isn't critical, it's just very handy to have a visual indication of spindle RPM's when woodturning.
I'm very pleased with the result.
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Reviewed in the United States on March 9, 2021
Reviewed in the United States on March 29, 2023
Customer image
AB
5.0 out of 5 stars Great Little Tachometer!!
Reviewed in the United States on March 29, 2023
Hello All! I purchased this tachometer to provide RPM information on my drill press. After reading several reviews, I thought I would do some additional measurements of the sensor for others to use in their decision making and engineering efforts. As the sensor is a hall effect device, the magnetic polarity of the supplied magnet in relationship to the sensor DOES matter. It is essential that the SOUTH pole of the magnet face the sensor. In order to determine which side of the magnet is the south pole, I used a smart phone app provided by K&J Magnetics called KJ Pole ID (iPhone version). Simply open the app and point the top of the phone towards one face of the magnet. The app will display the magnetic polarity that is currently facing the phone. Arrange the magnet such that the app displays "The SOUTH pole of the magnet is facing the phone", then mark the face of the magnet for easy identification prior to mounting.
When power to the sensor is ON and no magnet is present, the sensor will output 0VDC as shown in the picture. The red LED on the bottom of the sensor will also be illuminated. When the magnetic SOUTH pole of the magnet approaches the sensor (in my test, about a quarter inch), the red LED will turn off and the output of the sensor will switch to a positive DC voltage. In my test, this voltage is proportional to the supplied DC input voltage to the sensor minus approximately 560mV (Vout_sensor = Vdc_sensor - .560).
The rise time of the sensor, or the time it takes for the output of the sensor to rise from 10 percent to 90 percent of its steady value (Vout_sensor), is 114uS. This is with a 9VDC regulated DC power supply into the sensor. Please see the attached photo for additional details. The fall time (no photo attached), is much faster with a time of 160nS.

During the wiring portion of the assembly, it's important to note the colorings of the wires at the display and at the sensor.
The sensor color codes are as follows:
Brown: +DC supply voltage
Blue: GND
Black: Sensor Output Voltage (I called this Vout_sensor in my discussion above)

The tachometer display color codes are as follows:
Red: +DC supply voltage
Black: GND
Yellow: Sensor Input Voltage (Connect this lead to the Black lead of the sensor wiring)

As mentioned by Digiten, the DC supply voltage must fall into the range of 8VDC to 15VDC (Do NOT use an AC-output power supply). As an engineer, this implies that any supply voltage below or above this range can cause unexpected operation or failure of the product. My recommendation is to use a walwart-style (plug in) regulated DC power supply with an output voltage of either 9VDC or 12VDC. When connecting the power supply to the tachometer, make certain that the output polarity of the power supply correlates to the input polarity of the tachometer.

When mounting your display, I would recommend measuring the actual dimensions of your display first as mine were slightly different from the recommended cutout dimensions shown on the product page. The cutout portion of my display (the area behind the front mounting flange) measured 33.33mm by 68.26mm. The panel cutout dimension on the page has this listed at: 68x33mm. Those extra thousandths of an inch could make mounting the display a challenge depending on the supporting material.

In my next review, I will compare the RPM values from this tachometer to the RPM values calculated from a high-end encoder and RPM measuring device :) In summary, this is a well made and nicely constructed tachometer for the price!
Images in this review
Customer image Customer image Customer image Customer image
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7 people found this helpful
Report
Reviewed in the United States on January 4, 2024
Reviewed in the United States on March 1, 2024
Reviewed in the United States on January 19, 2020
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5.0 out of 5 stars Tachometer
Reviewed in the United States on January 19, 2020
I bought this for my Craftsman lathe. The headstock speed chart is so faded I can't read it anymore and I can't seem to find a chart that has the same belt arrangement I have. I used the indexing pin hole on the headstock housing for a bracket location after making a stud that replaced the pin. The entire install took a couple of hours and all I bought was a few set screws and socket head machine screws to do it. I also purchased a 9 volt battery adapter container with a switch to power it from Amazon. The readout is housed in a plastic container with a lid with a gasket to protect it from the elements. I bought that at Dollar Tree for you guessed it, a dollar. The wiring diagram is simple and I used tiny wire nuts I may later solder the connections and use heat shrink tubing to seal them. Once I located where the magnet should be I marked the chuck and degreased the spot and reinstalled the magnet with the correct polarity after placing a large drop of Super Glue on the spot just in case I accidentally move the magnet. The next day it was very secure. I ran the lathe without any glue on the magnet and it never moved but I decided to anchor it better in case I knocked it off. I ran the lathe and if my chart is right on the lathe from one of the belt arrangements that I can read it is within fifteen rpm's of the chart. Chart reads 685 and digital read 700. I'm not positive the pulleys are the original ones from Craftsman but I trust the digital.
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5 people found this helpful
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Reviewed in the United States on February 15, 2020

Top reviews from other countries

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G.J.Buchanan
5.0 out of 5 stars it works correctly
Reviewed in Canada on January 4, 2024
FabioC
5.0 out of 5 stars Soddisfatto, Ottimo acquisto
Reviewed in Italy on January 5, 2019
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FabioC
5.0 out of 5 stars Soddisfatto, Ottimo acquisto
Reviewed in Italy on January 5, 2019
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.
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2 people found this helpful
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SvenHansK
5.0 out of 5 stars Tut genau was es soll
Reviewed in Germany on April 8, 2019
Jean-Maurice GENSOUS
5.0 out of 5 stars efficace pour maîtriser sa Conso et en plus c'est joli !
Reviewed in France on January 20, 2019
Bertie
5.0 out of 5 stars Excellent....it works and sensible price
Reviewed in the United Kingdom on December 18, 2018
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Bertie
5.0 out of 5 stars Excellent....it works and sensible price
Reviewed in the United Kingdom on December 18, 2018
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!
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