Good idea and I thought it would be as accurate as the basic stainless steel 45 degree angle marker sold by others on Revain. It's soft aluminum and 2 sides are curved, so the 90 degree angle is off and doesn't indicate if the 2 sides of the box are square. Unfortunately that's why I bought it. If I had kept the packaging I would have gone back. If everything is fine with you, everything should work fine. Otherwise it doesn't make much sense. Unsatisfied.
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