How is the case dimention of a wrist watch measured......what is all is included?

If you are looking to purchase a new watch, you have likely seen that there is a measurement for the watch case. This does not mean the box which contains the watch. The watch case is the space between the two arms that extend above and below the watch where the band attaches. The end of the band will fit in between the watch case. You will need to know this measurement both in purchasing a new watch and in looking for a replacement band. Often, watch makers give this number in millimeters, and for that reason, you will need to use a metric ruler to make the measurement.
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1. Find the watch case. It is the space where the end of the band attaches to the watch face. Refer to the image for a picture of the location of the watch case.
   
2. Using the metric ruler, measure the distance from the inside of one of the arms to the inside of the other arm. Watch makers use the inside measurement when creating their watches, not the distance from the outer edges of the arms.
   
3. Write down the measurement on the piece of paper. Measure the other watch case, but they should both be the same measurement.