I really wanted to try this test angle, it looks great, is made with quality components and is a great price. The ruler has markings that are easy to read. However, the BIG problem is that it's not exactly square. I've tested mine against a number of other squares and the famous square metal block. Every time I get the same results, it's offset by 1/32 from the inside corner to the end of the ruler (8 inches). It does not violate general building and cutting requirements, but is useless as a setting square for saws and routers. I've had mine too long and can't get it back. I recommend going ahead and trying another brand.