Digital calipers are an absolute essential. Here at SparkFun we use them all the time. These premium calipers come with an extra battery and auto shut-off. Measurements can be taken in either metric or standard. The calipers are 6″ in length and make a great addition to any tool set.
These come with two 1.5V [LR44](https://www.sparkfun.com/products/11305) button cell batteries.
* [How to Use Digital Calipers](https://www.sparkfun.com/news/2310)
* [Battery Hack Tutorial](http://www.sparkfun.com/tutorials/362)
* [Product Video](https://www.sparkfun.com/videos#all/i7J7oHkCw4g/108)