Review on Enhance Precision in Framing Carpentry with Mr Carpenter Square Framing Carpenters by Gary Newman

The ruler is thick and solid and true 90 degree angle as far as I can tell. Inches/centimeters on opposite sides (left/right), so if you want to measure 10cm to the left and then 10cm to the right, you _can't_. b/c says "3.9" on one side instead. Also, I had significant wear on the numerals/measurement marks which I have little use for at home for crafting/sewing. I don't have any major suggestions for fixing the right-left problem, but it would be much better if the numbers were engraved rather than silk-screened.