Edward and Jack
If a person needs an "accurate square", it's very hard to beat the Staedler squares in an office supply store. You can get three of them for less than $10.00.
Groz makes a nice set of fixed squares also. There are three in the box and they're kind of small, but nice for machines, because you can get them into smaller places.
I have one "precision" square, or triangle. It's very large. It was purchased to setup the fence on the slider on my table saw. I use it in conjunction with a 6' Starret rule that lost its NIST certs many years ago, and thus became nothing more than a 6' long paint stirrer. We had actually put it in the scrap metal dumpster.
Woodpecker and Pinnacle have done the work for the end user. They might be expressing their accuracies in +/- inches tolerances for people to understand easier, but I bet their actual spec's are expressed in least, and most, significant digits, machine sample rates in MHZ and baud rates.
Last edited by Mike Cutler; 01-19-2024 at 3:15 PM.
"The first thing you need to know, will likely be the last thing you learn." (Unknown)