You should be fine swimming with it. Scuba diving - i'd never rely with my life on a rep watch. There are proper diving watches / computers for that purpose.
Water Resistance Chart
3 ATM, 30m, 100ft
Suitable for everyday use. Will withstand accidental splashes but not suitable for swimming.
5 ATM, 50m, 165ft
Suitable for everyday use and bathing but not suitable for swimming.
10 ATM, 100m, 330ft
Suitable for everyday use and swimming and snorkelling but NOT suitable for high board diving or sub-aqua diving.
20 ATM, 200m, 660ft
Suitable for all high impact water sports and scuba diving at depths not requiring helium gas. At these depths it is recommended to purchase a professional watch
20 - 50 ATM, 200 - 500m
Suitable for all high impact water sports, scuba diving and saturation diving.
100 ATM, 1000m
Suitable for deep sea diving and intergalactic travels.