Groz 6" Graduated Workshop Steel Square, 0.00028" Squareness Tolerance, Hardened Spring Steel Blade, Precision Machinist Try Square for Layout, Setup and Inspection (01143)

It's purpose is to sit on short end (stock) next to your table saw blade so you can adjust saw blade to square. Mine a 6" square blade with imperial markings etched into one side, to measure height of saw blade. There was no choice of cm or in markings. Higher square blade, more accurate square, but consider if the height ordered will clear your table saw blade guards. I have not checked this against Starett/other but relied on reviews, and visibly is accurate.

True, good weight and quality

Felt like I was buying it "sight unseen" since there were no reviews. I wanted a square that would measure from zero on the inside edge, and measure from zero from the base for vertical measurement. I would think that would be a good idea and expected to have no problem. However, the only squares I could find on Amazon that measure that way are the really(!) expensive ones. So I ordered this one hoping for the best and was not disappointed. It's solid and as near as I can tell perfectly square.

I used this to set up my miter saw, 90 degree bevel angle and to adjust the fence so that it was square to the saw blade. I also used it to correct low cost combo squares to make them accurate for woodwork tasks (these were not accurate when purchased). I filed the bearing surface for the sliding ruler using a fine file until the combo square was accurate with this engineering square. They were then accurate when checked using the normal pencil line test from a machined edge. I cleaned the grease off the square and coated it with camellia oil to prevent corrosion as I do with my chisels and planes.

I gave it a 4 star because I wish the graduated markings were on both sides of the square.

Square is square damnit

It is nice and heavy plus easy to use. I may want to order a longer one.

Square only has numbers on one side. It makes it inconvenient quite a bit