The typical diver's watch has a water resistance of around 200 to 300 m (660 to 980 ft), and the typical material used for crystals in diving watches is acrylic glass, which is very resistant to breakage.
The typical diver's watch will have a water resistance of around 200 to 300 m (660 to 980 ft), though modern technology allows the creation of diving watches that can go much deeper. The typical materials used for crystals are acrylic glass, hardened glass and synthetic sapphire which all have their pros and cons. Acrylic glass is very resistant to breakage; it can easily be scratched, but small scratches can be buffed out with polishing compounds. 
