the speed of my sprocket maybe in excess of 4000 rpm, will the magnet hold on at this speed or should I glue it

Glue it close to shaft. Another option is use something like this: LJ12A3-4-Z/BX Metal Detecting NPN NO 3 Wire DC 6-36V This is an inductive sensor which doesn't need a magnet but you can pick up on a bolt head which is what I did for my disco so that I could tell which wheel had lost traction

How close does the magnet need to be to the sensor?

Their customer support replies promptly to queries. They said, in email to me, 2-3mm is best - with south pole pointing at sensor. The leaflet with unit and spec says 10mm.

Can this unit be used with a diesel engine

Depends what you want to measure? This unit's sensor can be placed next to any rotating equipment (as long as there is space for a bracket, with the magnet on the rotating part) and measures RPM only. Would connect directly to 12V DC supply of a car battery/alternator.

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🚀 Elevate Your RPM Game!

COMPACT DESIGN - Lightweight and portable, fits seamlessly into your workspace.
COMPLETE PACKAGE - Includes hall sensor and magnet for effortless installation.
PRECISION MONITORING - Stay ahead of the game with real-time RPM tracking.
USER FRIENDLY DISPLAY - Bright red LED ensures visibility in any lighting.
VERSATILE COMPATIBILITY - Perfect for CNC, lathes, and more—your go-to for all machines.

The DIGITEN 4 Digital LED Tachometer is a high-performance RPM speed meter designed for precision monitoring across various machines. With a measurement range of 5-9999 RPM and a bright 0.56" red LED display, it ensures you never miss a beat. Powered by a DC 8-15V supply, this compact device comes complete with a hall sensor and magnet, making it the ideal choice for professionals in machining and manufacturing.

Reviews

C**L

As described

27.04.2025

M**T

Decent size display

Bought to monitor the speed of my old Myford lathe. Easy to wire up but ideally needs to be built into a box to protect the electronics and connections.You also need an external low voltage main’s adapter to power it, and it’ll work with any 8-15v DC supply ( I used a spare 12v one )The transmitter unit has a decent amount of thread on it to adjust the distance to the magnet which is fixed to the moving part.

13.09.2023

D**K

magnet needs to be round right way

Excellant product i fitted to my Sieg SC2 lathe no problem atall.I used a multi volt charger for power and stripped it down to fit inside control box . Took live feed from inside controll box.all very neat.Before fitting magnet pernament its got to be round right way.Saved me the cost of £179 for plug in Sieg one

25.09.2018

A**R

Working well on pillar drill

4.06.2021

J**S

Five Stars

easy to fit and works just as I would want it to

27.02.2018

D**B

Failed

Sadly the item didn't work when set up on contacting supplier a different wiring was given but this failed to work also,I returned theitem and received moneys back.

2.01.2017

A**M

Five Stars

purchased for a southbend lathe, it works very well and is handy to have

27.02.2017

A**L

Great Value

Great value for the money, fast stop confuses it for a few seconds, as it reports last RPM if the magnet doesn’t come around as expected, but thats to be expected and only for about ten seconds…

12.03.2023

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Trinidad and Tobagostore

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Manufacturer	DIGITEN
Brand	DIGITEN
Product Dimensions	7.11 x 3.56 x 2.03 cm; 60.1 g
Item model number	5864173439
Manufacturer part number	RPM1204RHA
Voltage	12 Volts
Item Weight	60 g

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

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