I bought a stainless steel protractor. You've probably seen the like. It has a scale engraved onto a rectangular piece with a moving rule that ends in an angle indicator marking. I don't have the manufacturer in front of me, but it was made in the USA, and it seems to be a well-made little tool.
I attempted to use this thing to see if saw blade is really set at 90 to the table, after doing my absolute best to dial it in using my square. It came in at 89+ on one side, and 91- on the other side. I checked my square, and it came in at 89+.
I checked two other squares, and both of them came in at 89+ too. One is Johnson combination square, another is a Stanley combination, and the last is a Stanley, um, whatever you call an L shaped piece of metal kind of square with no moving parts.
So do I trust the protractor or the squares? All were made in the USA, and all have been well-treated.
If I go buy a Starret (sp?) or comparable anal $BIGNUM square, will it read
90.0 on this protractor?