Hi, I also use a Srarrett #13A Double Square,(4") all the time, but they only come with a plain steal blade. A big improvement is to replace the blade with a satin chrome one from a 4" combo. square, part # CB4-4R. It is much easier to read with a non-glare finish and is rust resistant. I bought mine on eBay, but you can also buy them at MSI or McMaster Carr.
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