GROZ Engineer’s Precision Square| Ideal for setting up & checking jobs with extreme accuracy| Hardened spring steel blade| Blade Length: 75 mm| Stock Length: 60 mm| Squareness: 16 microns| SS/A/3

Good quality

Excellent precision. Worth for paid amount

It's a square, not much to say. Seems very well made and has some heft to it. I underestimated how small 4 inches was and I'll be getting the larger one from Groz

Trois grandeurs très pratiques

ok

Scratch building

I got this kit hoping all squares would "agree", that is, I could line them up and see little to no light between their mating surfaces. Well I was frustrated when the 4" had a noticeable gap from the 6", and the 2" had a noticeable gap from the 4". But when I mated the 6" and 2", the gap was really really tight. They started to stick.So based on this I can only conclude that the 4" is off.I dunno. The "general purpose" Groz 6" i also bought seems to have slightly more light coming through. I'm not sure what to expect at 16um. I guess it's not tight enough to start blue-ing light.update: the inside edge of the general purpuse groz 6" mated perfectly, with zero light, with the outer edge of the 16um 6" groz square. It was beautiful being identically square over the entire 6"