where do you get replacement tape

Instead of paying a $1 per strip, I use HVAC foil tape I had laying around the house. Only $10 for a 150-feet roll ($8 at HD/Lowes). Something like this https://www.amazon.com/Homemory-Aluminum-Inches-Yards-Furnace/dp/B01M7S4APP/ref=sr_1_7?s=industrial&ie=UTF8&qid=1506079959&sr=1-7&keywords=hvac+foil+tape

Can a reading be taken on the end of a 5/8" dia shaft, or do you have to put the reflective tape on the side of the shaft and aim laser from the side?

You can make a "flag" out of reflective tape and wrap it around the shaft, then all you need to do is aim the tach at the flag (not the center of the shaft). If you're still having trouble, try holding a 3x5 note card with it's edge aligned (parallel) with the center line of the shaft so that only 1/2 of the shaft is visible to the device, then it will only be able to measure the flag one time per rotation and it won't accidentally pick up the flag's reflection twice as it goes around.

how is the battery life when not in use... I had one similar to this one and if i left the battery in it would kill them. anyone else have this prob?

I received mine in December 2018. I use it infrequently. Up till now (about six months) the battery is still good and working well.

I know this unit can read off the RPM, but does it also count a number of revolution?

It does not count the total number of revolutions. You would have to do the math (RPM x minutes). This is a basic unit that shows a minimum and maximum value (RPM) obtained during a reading. It also requires reflective tape to be applied on the shaft (or rotating object). It's not a unit that you can just point and shoot and come up with various readouts.

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NEIKO 20713A Digital Tachometer, Noncontact Laser Photo Sensor with 2.5 to 99,999 RPM Accuracy, RPM Gauge Marker with Batteries Included

NEIKO 20713A Digital Tachometer, Noncontact Laser Photo Sensor with 2.5 to 99,999 RPM Accuracy, RPM Gauge Marker with Batteries Included

Product ID: 2719719

Details

Brand
NEIKO
Item Weight
6.4 ounces
Item dimensions L x W x H
6.25 x 4.25 x
Material
Crystal
Number of Items
1

🎯±0.05% accuracy

📏2" to 20" measurement distance

🚀2.5 to 99,999 RPM range

¥6461

Duties & taxes included

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎯 Master RPMs like a pro—measure with laser precision and never miss a beat!

ALL INCLUSIVE KIT - Comes with batteries, reflective tape, and a cushioned protective case—ready to deploy right out of the box.
PINPOINT PRECISION - Experience ultra-accurate RPM readings with a razor-sharp ±0.05% margin of error.
LASER FOCUSED SPEED - Instantly measure rotational speeds from a whisper-quiet 2.5 RPM up to a blazing 99,999 RPM.
USER CENTRIC DESIGN - Large, easy-to-read LCD screen and ergonomic, pocket-sized build for on-the-go professionals.
NONCONTACT CONVENIENCE - Get precise measurements from 2 to 20 inches away—no physical contact needed, keeping your workflow seamless.

The NEIKO 20713A Digital Tachometer is a professional-grade, noncontact laser RPM meter designed for precision diagnostics. With an impressive accuracy of ±0.05%, it measures rotational speeds from 2.5 to 99,999 RPM at distances up to 20 inches. Its large LCD display, ergonomic design, and included accessories make it an essential tool for automotive, industrial, and mechanical professionals seeking reliable, instant RPM data.

Specifications

ASIN	B000I5LDVC
Batteries	1 9V batteries required.
Battery Cell Type	Alkaline
Best Sellers Rank	#6,144 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1 in Industrial Tachometers
Color	Black
Customer Reviews	4.3 4.3 out of 5 stars (2,708)
Date First Available	February 22, 2006
Included Components	Digital Tachometer
Item Package Quantity	1
Item Weight	6.4 ounces
Item model number	20713A
Manufacturer	Ridgerock Tools Inc.
Material	Crystal
Measurement Accuracy	+/- 0.05
Number Of Pieces	1
Part Number	20713A
Power Source	Battery Powered
Product Dimensions	6.25 x 4.25 x 1.75 inches
Size	Tachometer
Special Features	Lightweight
Style	Tachometer
Warranty Description	Limited lifetime Warranty

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