can you run the wires for power directly to the power switch on my wood lathe?

Hello; The requirement for the 4-digit counter is a DC voltage between 8 and 15 VDC. Your switch, I presume, switches 120VAC to the lathe if you live in the U.S., and 240VAC if you live in Europe, England, or a few other countries. It would make for a nice fireworks display if you connected this device to a higher AC voltage. What I did was to buy a small 120VAC to 12VDC low current power supply, and it was about the size of a small box of matches, perhaps an inch (25mm) on the longest side. The power supply and display come on with the switch, and report on my lathe's RPM just nicely. I hope this helps, best of luck, Ken

what is the thread pitch of the Hall sensor threads

12 mm x 1 mm pitch. Kind of an oddball size. Hope this helps

Can I use a 3/16" or 1/4" dia. magnet that is longer, so I can drill a hole in a pulley, so it can't fly off?

Your probably better off with a drop of 2 part epoxy or super glue. By drilling the pulley and replacing with a different density material you may change the balance and induce vibration. I just let the magnet hold it on my wood lathe shaft so far to 1200rpm.

I have a vfd suppling power to a 3 phase motor, the vfd has a terminal with 10vdc output connection but only allows 10ma is that enough power to run

Enough power to light up a small LED but nothing else.

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

Product ID: 28592239

Details

Brand
DIGITEN
Item Weight
3.5 Ounces
Item dimensions L x W x H
2.8 x 0.8 x
Material
Voltage
12 Volts

⚡DC 8-15V power range

💡0.56" bright green LED display

🔄5-9999 RPM measurement range

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Description

🚀 Measure your speed, master your craft — never miss a beat with DIGITEN!

PLUG PLAY SIMPLICITY - Easy snap-in installation with clear wiring instructions—get up and running in minutes.
PRECISION RPM TRACKING - Accurate ±2-3% measurement for motors up to 9999 RPM keeps your workflow flawless.
VERSATILE INDUSTRIAL USE - Perfect for lathes, CNC machines, conveyors, and more—engineered for professional environments.
REAL TIME VISUAL FEEDBACK - Bright green LED display ensures instant RPM readings, reducing downtime and guesswork.
RELIABLE HALL SENSOR TECH - Durable NPN Hall proximity sensor with magnet ensures consistent, non-contact RPM detection.

The DIGITEN 4 Digital Green LED Tachometer is a high-precision RPM speed meter designed for industrial and professional use. Operating on DC 8-15V, it measures motor speeds from 5 to 9999 RPM with ±2-3% accuracy. Featuring a bright 0.56" green LED display and a reliable Hall NPN proximity sensor with magnet, it offers easy installation and real-time RPM monitoring for lathes, CNC machines, conveyors, and more.

Specifications

ASIN	B01FQMI18Y
Best Sellers Rank	#27,466 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #5 in Industrial Tachometers
Brand Name	DIGITEN
Customer Reviews	4.4 4.4 out of 5 stars (713)
Item Dimensions	2.8 x 0.8 x 1.4 inches
Item Weight	3.5 Ounces
Manufacturer	DIGITEN
Material Type	PLA_(Polylactic_Acid), PE_(Polyethylene)
Model	5823950920
Part Number	RPM1204GHA
Voltage	12 Volts

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COP 123555

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In stock

Sold byAmazon ColombiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Colombia.

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TrustScore 4.5 | 7,300+ reviews

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