Bought for COVID testing at my optometry practice. It won't stay in Fahrenheit. I can change it to Fahrenheit but next time it will be in Celsius. I followed the instructions correctly (and some of my colleagues tried too) and it doesn't stay on F. We just learned what we need to know to use it in C.
β Stainless Steel L-Square, Size 3-Inch x 4-Inch, Zona 37-434
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π² Johnson RAS-1B Johnny Square: Professional Aluminum Rafter Square, 7'', Silver - Top Quality with 1 Square
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Kapro 307-08-TMS Try And Mitre Layout And Marking Square With Stainless Steel Blade, 8-Inch Length
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Kapro - 353 Professional Ledge-It Try & Mitre Square - For Leveling And Measuring - Features Stainless Steel Blade, Retractable Ledge, And Etched Ruler Markings - 12 Inch
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