What water resistance means
Water resistance is the ability of a watch to withstand different ways of exposure to water – from splashes to saturation diving. Water resistance ratings are listed in depths or pressure, usually metres which appear on the watch dial and/or case back.
What dept rating means
The depth rating actually signifies the results of a static pressure test, undertaken in a laboratory environment. The number of meters shown is not to be confused with how deep underwater a watch can go. Except a watch is built specifically for deep sea diving the water resistance feature means that the watch is not designed for prolonged use under water.
WR without rating
A watch marked as water-resistant without a depth indication is designed for accidental splashes only. Take a look at the water resistance chart for specific information.