Now you can look at the markings on both the ruler and the blade. Once it’s been properly hooked, pull the blade until you notice the hook extends until excesses its maximum range. Hook your tape to the true zero point of the steel ruler. In this case, the hook is suspected of getting loosen than it’s used to. After having them, here are the steps: 1. At least you have to have these two kinds of pliers as shown above. One is for locking the hook at the rivets area and one is for adjusting the hook tab. You have to prepare two kinds of pliers here. Need to remember that not pushing yourself harder while using a steel ruler is adequate to calibrating a tape measure. You may have to replace it with the new one or you continue using it with a certain condition. Unfortunately, not all inaccuracy sources can be solved by hand. Just make sure you are buying a good one. While a gauge block provides highly accurate calibration, the steel ruler gives you an alternative and cheaper option. Don’t worry because you can switch to a steel ruler. In other words, you are better off buying a new one. It costs more than the average of the best tape measure ones. Not only can it calibrate a tape measure, but also can be used to calibrate micrometers, calipers, and steel rulers.Ī gage block might seem expensive for you. There is a well-known tool to calibrate a tape measure. Further, if your tape measure is 25 feet which equal to 7.62 meters, then the total length gain is only 0.0027432 meter or 2.7432 millimeters or 0.108 inches which is considered as a small number and can be ignored. If we refer to the steel linear thermal expansion coefficient which is 7,2 x 10 -6m/☏ and as the simulation, the increase in temperature is 50☏ (from 68☏ to 78☏) then we can calculate the gain of blade’s length is only 0.00036 meter per one meter steel. However, we can ignore it because the length’s change is only a very small number. If too cool, the steel will shrink and reduce its length. If too hot, the steel will expand and the blade gains more length than before. The best time to use it is when the surrounding temperature of about 20 ☌ (68 ☏). Expansion or Stretchingīecause the blade is made of steel which physically has linear expansion property, using it at high temperature is a bad idea. The hook which getting loose can mess up the measurement. The markings that fade can cause a high risk of human errors. This is the most often problem that makes a tape measure inaccurate. Regular inspection will be held to keep the quality remain the same to all products.
#Standard error measurement tape measure license#
Tape measure companies should license their machines and products to the concerning services before going to the market. Inaccurate MarkingsĪ machine that prints or etches the markings on the blade inaccurately can ruin the accuracy and precision of the measuring tapes.
It might become inaccurate according to some reasons: the inaccurate linear-marks printing process, long use, and temperature. It’s important to keep your tape measure accuracy remain the same all the time. Factors that Cause a Tape Measure Inaccurate Once you diagnose your tape measure using the calibrator, then you can decide whether to continue using it or fix it or replace it. It just needs a tool which is commonly called calibration tool. Before you go measuring, it’s better off calibrating your tape measure to ensure its accuracy.
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