Acumen Stopwatch - Manual (Page 101)

97
Caution: Global Reset will CLEAR UP EVERYTHING which Include your
Personal Settings and Personal MET Calibration Value.
Battery Replacement
We recommend that you take it to a local jewelry store in order to insure it
will maintain its water resistance. Improper battery replacement or service
will void the warranty. If you feel comfortable replacing your own batteries,
be careful to notice how the old battery comes out and the proper
positioning of the hold-down contacts before removing it. Also, be careful to
line up the O-ring gasket properly before replacing the battery door cover.
To insure water resistance, it's a good idea to smear a small drop of silicone
lubricant spray on the rubber O-ring.
Part IV