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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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% ultra-precise accuracy

📏Noncontact laser sensor, 2"-20" range

🚀Measures up to 99,999 RPM lightning-fast

€ 43.09

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Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎯 Master RPMs like a pro—precision meets power in the palm of your hand!

SPEED DEMON READY - Capture ultra-high rotational speeds up to 99,999 RPM instantly with a high-speed laser sensor.
PINPOINT PRECISION - Experience razor-sharp RPM readings with ±0.05% accuracy—never second-guess your measurements again.
USER CENTRIC DESIGN - Large, crystal-clear LCD display and ergonomic handheld size make diagnostics seamless and stylish.
ALL INCLUSIVE PRO KIT - Comes with batteries, reflective tape, and a cushioned carrying case—ready to perform wherever you go.
EFFORTLESS NONCONTACT MEASUREMENT - Stay safe and efficient by measuring from 2 to 20 inches away—no physical contact needed.

The NEIKO 20713A Digital Tachometer is a professional-grade, noncontact laser RPM meter designed for precision diagnostics. With an ultra-accurate ±0.05% margin of error and a wide measurement range from 2.5 to 99,999 RPM, it delivers instant readings on a large LCD screen. Its compact, ergonomic design includes reflective tape, batteries, and a protective case, making it the ultimate tool for automotive, industrial, and mechanical professionals who demand speed and accuracy on the go.

Specifications

ASIN	B000I5LDVC
Best Sellers Rank	#6,868 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1 in Industrial Tachometers
Brand Name	NEIKO
Customer Reviews	4.3 4.3 out of 5 stars (2,666)
Global Trade Identification Number	00837013207139
Included Components	Digital Tachometer
Item Dimensions	6.25 x 4.25 x 1.75 inches
Item Weight	6.4 ounces
Manufacturer	Ridgerock Tools Inc.
Material Type	Crystal
Model	20713A
Part Number	20713A
UPC	837013207139
Unit Count	1.0 Count
Warranty Description	Limited lifetime Warranty

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