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It appears to be about 1/2 degree off at 45 degrees when compared to a measuring square. The arms on the protractor have a slight spring-back in the friction of the arms so to get the most accurate measurement you need to take your readings while holding the arms firmly to your measured surface. After some practice on scrap pieces I was able to compensate for the slight inaccuracy and it turned out to be a pretty useful tool.
Verified purchase: Yes | Condition: New
This tool is supposed to make me a better craftsman by getting exact corner angles to make the perfect mitre angle. It was 2 degrees off at 90 degrees while I sat it on a known to de accurate 90 degree square. Since it is inaccurate it is completely worthless. I returned it. I have ordered a metal one which has the numbers imbedded in the metal so I am hoping it will be accurate.
Verified purchase: Yes | Condition: New
Great little protractor. Makes quick work of cutting crown molding with odd ball walls. It figures the cuts for you, you just set your saw and go. I had one of the first ones and someone "borrowed" it. So I have been so impressed I bought a second one. WELL made.
Verified purchase: Yes | Condition: New
Protractor arrived on time, used it right away and was accurate and easy to use.
Verified purchase: Yes | Condition: New
One of many great products made by Starrett. Dial is easy to read. Arms are a good length for placing against saw blade and table.
Verified purchase: Yes | Condition: New
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