The Casio Sadokei is a watch you can wear in the sauna

Casio’s Sadokei watch can withstand temperatures of up to 100 degrees celcius, reports The Yomiuri Shimbun, but they don’t want you to swim in boiling water. It’s for the sauna. The battery is heat-resistant and encapsulated within a water-resistant resin, and it comes with a stretchy band that looks like an old-timey phone cord. It comes in black and w…