30-Minute Register is a type of watch complication found on some watches that keeps track of the number of minutes that have elapsed since the start of the hour. It is usually displayed on the watch face as a sub-dial or a small hand that rotates around the edge of the face. The 30-Minute Register can be used to help keep track of elapsed time, such as during a meeting or a timed event. It is also useful for ensuring that the time on a watch is accurate, as the 30-minute Register will reset when the hour changes.
