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 Sensor NPN

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

Product ID: 234891026

Details

Brand
DIGITEN
Item Weight
3.5 Ounces
Item dimensions L x W x H
7.1 x 2 x 3.6
Material
Plastic
Voltage
12 Volts

⚡DC 8-15V power range

💡0.56" bright green LED display

🔄5-9999 RPM measurement range

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Description

🚀 Elevate your RPM game with precision and style!

PRECISION RPM TRACKING - Accurately measures motor speeds from 5 to 9999 RPM with ±2-3% accuracy, ensuring flawless performance monitoring.
PLUG PLAY HALL SENSOR - Includes a reliable Hall NPN proximity sensor with a 10mm detection range for seamless integration and real-time pulse detection.
COMPACT DURABLE DESIGN - Sleek M12 cylindrical sensor and compact tachometer (72x36x20mm) built to fit tight spaces and withstand demanding environments.
VIBRANT GREEN LED DISPLAY - Features a crisp 0.56-inch green LED readout for instant, clear RPM visibility even in low-light industrial settings.
WIDE VOLTAGE COMPATIBILITY - Operates efficiently on DC 8-15V, making it adaptable to various machinery and power setups without hassle.

The DIGITEN 4 Digital Green LED Tachometer is a high-precision RPM speed meter designed for professional use in CNC machines, lathes, mowers, and more. Powered by DC 8-15V, it measures speeds from 5 to 9999 RPM with ±2-3% accuracy. Equipped with a Hall NPN proximity sensor and a bright 0.56-inch green LED display, it offers reliable, real-time RPM monitoring in a compact, durable form factor.

Specifications

ASIN	B01FQMI18Y
Best Sellers Rank	#113,289 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #154 in Motion, Speed & Force
Brand	DIGITEN
Brand Name	DIGITEN
Customer Reviews	4.3 out of 5 stars 633 Reviews
Item Dimensions	7.1 x 2 x 3.6 Centimeters
Item Weight	3.5 Ounces
Item dimensions L x W x H	7.1 x 2 x 3.6 Centimeters
Manufacturer	DIGITEN
Material	Plastic
Material Type	Plastic
Model Number	5823950920
Part Number	RPM1204GHA
Voltage	12 Volts

Reviews

A**ー

25.10.2024

D**E

19.11.2024

F**C

5.01.2019

A**R

9.12.2025

S**K

8.04.2019

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C$4572

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Sold byAmazon NicaraguaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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

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