What Are The Red Numbers On A Tape Measure For?

Of the many numbers found on a tape measure, the red ones are most mysterious to countless tool users. Ever wanted to know what they're for?
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How to Read a Standard Tape Measure - The way I learned

How to Read a Standard Tape Measure - The way I learned G7 has been Trump-proofed to avoid trouble – here’s how US Pilots Fly Gigantic B-1 Lancer So Fast the Cockpit Starts to Shake ‘No Kings’ ...