# What are the Holey Calbration Perfect Measurements?

**URL:** <https://forums.maslowcnc.com/t/what-are-the-holey-calbration-perfect-measurements/12201>\
**Category:** Technical Details\
**Created:** [January 19, 2020, 6:12pm UTC](https://forums.maslowcnc.com/t/what-are-the-holey-calbration-perfect-measurements/12201 "2020-01-19T18:12:35Z")\
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**Author:** ![dlang](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/dlang/32/859_2.png) [@dlang](https://forums.maslowcnc.com/u/dlang)\
**Post date:** [June 13, 2020, 5:48am UTC](https://forums.maslowcnc.com/t/what-are-the-holey-calbration-perfect-measurements/12201/9 "2020-06-13T05:48:11Z")

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there is also the question of how accurate the tape is (class 1, class 2, or  
worse than that), see  
[In search of accurate measurements](https://forums.maslowcnc.com/t/in-search-of-accurate-measurements/9581) for a  
vernier adapter I designed to work with metric tape measures (and a discussion  
on tape measure accuracy). Rockler has a good imerial/metric tape measure that’s  
a class 2 tape that’s not that expensive ($10)

[https://www.rockler.com/fastcap-procarpenter-standard-metric-tape-measure](https://www.rockler.com/fastcap-procarpenter-standard-metric-tape-measure)

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