7cm) and some more innovative ones even take the length of the tape into account by compensating for the case length on the blade or by using a viewing window. Some pocket tape measures feature a case with a known length (e.g. Be sure to use the hook properly when using your tape measure! Not only does this keep the blade in place whilst measuring, it also guarantees an accurate measurement by compensating for the thickness of the metal hook in the measurement. When taking external measurements, however, the hook can be placed around/behind the object and pulled gently towards the measurer. skirting board) providing an accurate measurement. from the inside edge of an object such as between one internal wall and another) the hook can be pushed against the object (e.g. Some people mistakenly think of this as a manufacturing defect but this is not the case. In other words it moves in and out ever so slightly. You will normally find (on any pocket tape of quality) that the hook 'floats'. In pocket tapes (as seen in the image below), this is usually a straight piece of metal attached to the blade by a number of rivets. The hook or 'tang' of the tape measure is the small, usually metallic component at the end of the blade.
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