The part of a wristwatch that contains the watch face and mechanism is referred to as the watch case and is typically measured in millimetres (mm). Men's watches are usually between 37mm and 42mm, while women's watches are typically between 26mm and 36mm. There are two ways to measure the diameter of a watch case in millimetres.
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Find a small cloth measuring tape, such as the kind often used for sewing and alterations, which can be bought at most grocery stores, drugstores and sewing/craft stores. Make sure the tape lists millimetres as a measurement.
Place the "zero" end of the measuring tape on one side of the watch case. If there are stems or crowns on the side of the case, place the measuring tape at that point.
Gently pull the measuring tape taut across the face of the watch at its widest point to the other side, including any stems or crowns.
Note the number of the measurement. This is the diameter of the watch case in millimetres.
Look for digital readers, available at most watch repair stores or online, for measuring a watch face. These readers use a small metal gauge to measure the watch case's diameter and then display the number on a digital reader.
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