Question 1

What is the accuracy of the squares?

Accepted Answer

I contacted Grizzly about the accuracy, their response: "they are going to be highly accurate and manufactured to DIN 875-1 standards"

Here is a link to a PDF of DIN 875 speciation's: 
http://www.limit.se/FineToolsAPI/DownloadFile.aspx?fileid=4363.pdf&filekey=00a4785de3279caf2124f8f62fb373d1

Use the "1" column for the specifications. Yes, they are in metric because DIN is the Deutsches Institut für Normung (English: German Institute for Standardization)

Question 2

how are the reviewers checking for stainless steel and squareness?

Accepted Answer

If you have a good flat surface (stone countertop could work, if not a surface plate) you can simply put two squares back-to-back flush against each other, and see if any light appears between the top or bottom of the blades (or anywhere along the middle, if they are not accurately flat). This can be a very sensitive test if all surfaces are accurately flat.  Doing one such comparison only shows that two squares add to 180, not necessarily that each is 90, but you can prove that by comparing each with a third square.

Question 3

What is the accuracy of the squares?

Accepted Answer

I can not give an accuracy measurement as I no longer have access to surface plate and height gage.  However, compared to my other equipment, I would estimate within 0.001" - 0.002" for the 7" square.

Question 4

dimensions of each square?

Accepted Answer

The overall dimensions for each square are as follows:7.25" x 4.25",  5" x 3.25",  4" x 2.75",  3" x 2.25"All three of the smaller squares are made from 0.75" wide material. The large square is made from 1" wide material. Hope this helps.

ASIN	B0000DD4EE
Best Sellers Rank	#916,134 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #984 in Carpentry Squares
Brand Name	Grizzly
Color	Original version
Customer Reviews	4.1 4.1 out of 5 stars (656)
Global Trade Identification Number	00690550129933
Item Dimensions L x W	8.1"L x 5.6"W
Manufacturer	Grizzly
Material Type	Alloy Steel, Stainless Steel
Model	H2993
Part Number	H2993
Style Name	Square
UPC	690550129933

Grizzly H2993 Machinist's Square Set, 4-Piece

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