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

DIGITEN 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
Number of Items
1

⚡DC 8-15V power range

💡0.56" bright green LED display

🔢5-9999 RPM measurement

¥6962

Duties & taxes included

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚀 Elevate your RPM game with DIGITEN’s precision green glow!

SMART AUTO ZEROING - Automatic clear zero function resets in seconds, so you stay focused on precision without manual hassle.
PRECISION RPM TRACKING - Accurate ±2-3% measurement for motors up to 9999 RPM keeps your workflow flawless.
INSTANT VISUAL FEEDBACK - Vibrant green LED display ensures you never miss a beat on your lathe or conveyor speed.
PLUG PLAY HALL SENSOR - Includes reliable NPN Hall proximity sensor and magnet for seamless RPM detection within 2-3mm range.
VERSATILE INDUSTRIAL USE - Perfect for lathes, CNC machines, mowers, and conveyor belts—engineered for diverse professional environments.

The DIGITEN 4 Digital Green LED Tachometer is a compact, high-accuracy RPM speed meter designed for industrial applications like lathes and conveyor belts. Powered by DC 8-15V, it measures speeds from 5 to 9999 RPM with ±2-3% accuracy, featuring a bright 0.56" green LED display and an included Hall NPN proximity sensor with magnet for reliable, contactless RPM detection.

Specifications

ASIN	B01FQMI18Y
Best Sellers Rank	#31,845 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #8 in Industrial Tachometers
Brand Name	DIGITEN
Customer Reviews	4.4 4.4 out of 5 stars (723)
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
Unit Count	1 Count
Voltage	12 volts

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