The Water Resistance of your watch will be marked on the dial and/or case back of your watch. If the marking shows 'Water Resist' this means it can withstand droplets or splashes of water but should not be immersed. If the rating is marked in bar then the equivalent pressure ratings are 10 Bar = 100m rating, 20 Bar = 200m . To understand what purpose you can use your watch for please see the chart above.