This square is clearly not well made. After removing the packaging I ran a double line test and the results were as follows. promising. Upon closer inspection, the faces of the heads were not flat due to poor workmanship, leading to inaccurate measurements. I pulled out the flat glass and some sandpaper and then started smoothing the edges. After a few hours of sanding, I pulled out the double strip and it was spot on to the end. After that I applied a thin coat of mineral oil to it. While far from perfect, a little work yields fairly accurate results for under twenty bucks! The centimeter scale is a nice bonus.
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