Changes to Step #3

Edit by Dave Ogles —

Edit approved by Grégoire Saunier

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[title] Mandatory tools
[* 10] This step and the previous one list the ***mandatory*** tools you need to build the Bear frame.
-[* 2] Having a quality square will help you to build the Bear precisely. We recommend a ***200mm long machinist precision square***, ideally with standard DIN 875 (any grade).
- [* 10] If you don't have such square or want to use a lower quality one, check those videos on how to test and fix your square:
+[* 2] Having a quality square will help you to build the Bear precisely. We recommend a ***200mm long machinist precision square***, ideally with standard DIN 875 / BS 939 (any grade).
+ [* 10] If you don't have such a square or want to use a lower quality one, check these videos on how to test and fix your square:
[* 1] ''How to Square a Square'' by Wesley Treat: https://youtu.be/FNpAQHrNpNU
[* 1] ''How to Square a Square and Make it True'' by Wood By Wright: https://youtu.be/enEYzTXg2Jg
-[* 7] Caliper, 150mm long minimum. If you don't have a caliper you can use a steel ruler.
+[* 7] Caliper, 150mm long minimum. If you don't have a caliper you can use a steel ruler. (A vernier caliper is generally more accurate than a digital caliper, at the same price point.)