The watch is also water resistant to 50m, and Casio says it can withstand temperatures up to 212°F, which is the boiling temperature of water. (Hopefully, your sauna is much cooler than that.) ...
The Casio F-91W is probably the most popular ... the watch is significantly more water resistant. Filling a watch with mineral oil is done simply by disassembling the watch, submerging it in ...