![]() ![]() OUTSIDE CHECK If the tape measurement is GREATER THAN the ruler on outside check, the tape hook is too short and needs to be bent toward the tape. The amount of the measurement difference from 1 inch is the amount the hook need to bend. If the tape measurement is LESS THAN the ruler on inside check, the tape hook is too short and the hook must be bent out from the tape. INSIDE CHECK If the tape measurement is GREATER THAN the ruler on inside check, then the tape hook is too long and must be bent toward the tape. Remember these measurements were read on the TAPE at the 1 inch mark of the ruler. Gather your notes from your initial checks for inside and outside accuracy. Without proper calibration, a tape measure used for inside measurement and then used to measure and mark material for cutting will result in shorter or longer material than expected. When the hook travel is the same as the hook thickness, the inside and outside measurements will both be accurate. The travel is to compensate for the thickness of the hook when measurements are made with the hook pushed against inside surfaces or when hooked on the edge for outside measurements. As they say, this is not a problem, it is a feature. The hook on the end of the tape measure is made with a small amount of travel at the attaching rivets. Proceed with your fun projects with confidence in accurate measurements. If the tape passes the test, you can skip to the end knowing your tape measure is accurate. If the tape measure is still accurate, only the initial tests (Step 2 and Step 3) will be needed. Successful calibration will return the tape measure to accuracy. However, damage from dropping the tape measure or long use will make measurements inaccurate. This may sound unnecessary or even silly. In this Instructable, you will learn how to calibrate a steel, retractable tape measure. ![]()
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