Using the adjustment ring
For setting the start time and duration of an activity. Line up the marker on the adjustment ring with the minute hand. Timing starts at the time indicated by the marker. The elapsed time is indicated by the minute hand pointing the number on the adjustement ring.
IMPORTANT: After being submerged in salt water, the Scuba 200 Chrono should always be rinsed with fresh water.
CAUTION: The Irony Scuba 200 Chrono is not a professional diving watch.