Reply by MrRon

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Posted on The most accurate square I have.

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5784 posts in 3808 days

#1 posted 01-12-2018 09:10 PM

I kept buying all kind of square tools from big box stores, Sears and so on, like combination square, speed square etc etc. None of them was actually square and would deviate a millimeter or so at the end.
The one that I hope finally stopped my buying streak is this one. I tested it with a feeler gauge and could not insert the smallest blade at any of the ends both at 90 and 45 degrees. It saved me some money by not letting me buy some super expensive stuff and paid for itself on the first use, when trying to make mitered panel doors where exact 45 cut is crucial.

- Carloz

How could you tell if the square was 90° or 45° with a feeler gauge? All the feeler gauge would tell you would be if the edge was straight or not. To check for a 90°, you have to check it against something that is in fact 90°, like a precision combination square; the same for 45°.

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