I got this model because I always have trouble measuring angles when I want to cut wood (e.g. to cut wood that needs to be lined up at 45 degrees) . This ruler/square is perfect for that. I have shown pictures of how it reads exactly 90 degrees for my rectangular tiles. You can also see that this ruler, when opened in a straight line, measures about 180 degrees. There is also a handle that you can loosen or tighten if you want to make it easier or harder to open or close. Finally, an added bonus that I wasn't expecting - an extra unopened battery was included, which turned out to be a popular size (CR2032). A minor complaint is that the numbers don't start from the outside. You start in the middle. But then again, I'm not going to use it to measure, so I don't really care. Overall, I am very satisfied with this product and can only recommend it!
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