Most manufacturers recommend you rinse the scuba diving watch in fresh water after use in seawater. By leaving the scuba diving watch in freshwater over nite will protect the watch from corrosion and to keep the crown, buttons and pressure sensors on digital ones working. Divers also have to inspect their watch and wrist band for defects before every dive and especially in case it came into contact with gasoline or strong chemicals, powerful magnetic fields or was knocked something hard during use.