Degree of Water Resistance of Casio Watches

Water Resistance: Wearable while water is being splashed but not under any pressure.

50M Water Resistance: Wearable around sinks, during swimming, athletic sports, in shallow waters, but not while snorkeling or scuba diving.

100M Water Resistance: Wearable around sinks, during swimming, poolside diving, snorkeling, but not while jet-skiing or scuba diving.

200M Water Resistance: Wearable around sinks, during swimming, poolside diving, snorkeling, jet skiing, but not while scuba diving.

DIVER'S WATCH 200M: Wearable while scuba diving at depths not requiring helium gas.

ATM = Atmosphere
Only watches marked with the words “DIVER‘S WATCH 200M” can be worn while scuba diving (with air tanks).
Even if a watch is water-resistant, do not operate its buttons or crown while it is submersed in water or wet.
However, “DIVER’S WATCH 200M” casing models permit underwater button operation.
After submersion in seawater, use plain water to rinse all salt and dirt from the watch.
Even if a watch is water-resistant, avoid wearing it in the bath or in area where detergents (soap, shampoo, etc.) are being used.
Such conditions can reduce water resistance.