Here is another item that arrived from Shipito last week. We have discussed techniques of how to determine if sometime is square or a surface is at 90 degrees to another. This square provides another means to do this. I want to use it to test some precision scraped angle plates and squares that I have. The magnetic cylinder squares come in different sizes. I have seen them as small as a 1 inch base with a 3 inch stem to ones with a 6 inch base and 12 inch plus stem. This particular one has a 3 inch base and 6 inch stem.
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