# Source: https://learn.adafruit.com/calipers/battery-life-and-replacement.md

# Calipers

## Battery Life & Replacement

![](https://cdn-learn.adafruit.com/assets/assets/000/000/853/medium800/hand_tools_battery.jpg?1396766443)

Digital calipers do require a battery (there are solar ones as well, with an internal backup battery) but good calipers rarely need to have the battery replaced. The pair we have is used many times a day and often isn't even turned off for a few days but has been running without issue for over 5 years. We do suggest turning them off when not in use but many people don't even bother since the battery drain is so low.

To replace the battery, just snap of the top cover, the battery is&nbsp; **LR44/SR44&nbsp;** size 1.5V button battery, available in any hardware or grocery store. The Silver Oxide SR44 costs more, but will last longer.

- [Previous Page](https://learn.adafruit.com/calipers/storage.md)
- [Next Page](https://learn.adafruit.com/calipers/setting-the-origin.md)

## Featured Products

### Mitutoyo - Absolute Digimatic Digital Calipers, 6 in.

[Mitutoyo - Absolute Digimatic Digital Calipers, 6 in.](https://www.adafruit.com/product/294)
The most useful tool we've ever laid our hands on. &nbsp;We thought we'd use them just for electronics but then we got our hands on these calipers and had so much fun we started measuring&nbsp;_everything._

They're indestructible - which is good because we don't...

No Longer Stocked
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[Related Guides to the Product](https://learn.adafruit.com/products/294/guides)
### Premium Digital Stainless Steel Calipers

[Premium Digital Stainless Steel Calipers](https://www.adafruit.com/product/1724)
The most useful tool we've ever laid our hands on. These calipers are really good quality and an excellent choice if you need something better than a cheap 'disposable' pair of digital calipers but you're not quite ready for a set of high-end Mitsutoyo calipers. These digital...

No Longer Stocked
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[Related Guides to the Product](https://learn.adafruit.com/products/1724/guides)
### Solar Digital Calipers

[Solar Digital Calipers](https://www.adafruit.com/product/3720)
_Praise the sun!_ You will never have that awkward situation where your caliper battery dies just when you need to take a measurement. Sure, if you have the budget, [we recommend these near-indestructible high-end Mitutoyo...](https://www.adafruit.com/product/294)

In Stock
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[Related Guides to the Product](https://learn.adafruit.com/products/3720/guides)
### Messograf Pen Calipers

[Messograf Pen Calipers](https://www.adafruit.com/product/810)
Discontinued - **you can grab [Solar Digital Calipers&nbsp;](https://www.adafruit.com/product/3720)instead!&nbsp;**

&nbsp;

Caliper rule? Tire tread gauge? Ruler? Thread scale? Writing instrument? The Messograf is all of these in one.  
  
It is a...

No Longer Stocked
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[Related Guides to the Product](https://learn.adafruit.com/products/810/guides)

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