Key Takeaways
1. The Casio SAN100, known as the Sadokei or Sauna Watch, is now available in the U.S. after its initial launch in Japan in late 2024.
2. Designed for sauna use, the watch withstands temperatures up to 100°C (212°F) and high humidity for 15 minutes, with a 50 m water resistance rating.
3. The watch features an analog dial, a mode button for toggling between Standard Time and Sauna Mode, and a 12-minute timer for sauna sessions.
4. It has a lightweight design (25 g) and a comfortable coil-style band, making it user-friendly for sauna enthusiasts.
5. The black model SAN100H-1B is priced at $110, with a white and orange model SAN100H-7B expected to be available soon at the same price.
The Casio SAN100, which is also referred to as the Sadokei or Sauna Watch, is now for sale in the United States. This model was first introduced in Japan in late 2024, where it was initially funded through crowdfunding, before making its broader debut in this country in September 2025.
Features and Specifications
As the name indicates, the Casio SAN100H-1B and SAN100H-7B models are specifically made to be used while in a sauna. These watches can handle extreme temperatures up to 100°C (212°F) and endure high humidity for about 15 minutes. They also come with a 50 m water resistance rating. Additionally, the heat-resistant BR1225A battery is claimed to last for as long as five years. The dimensions of the watch are 40.2 x 35.4 x 12.9 mm (approximately 1.58 x 1.39 x 0.51 inches), and it has a lightweight design at 25 g (around 0.88 oz).
Design and Functionality
The Casio SAN100 features an analog dial with two hands and Arabic numbers. On the upper left side of the non-metallic resin case, there is a mode button that allows users to toggle between Standard Time Mode and Sauna Mode. The Sauna Mode includes a 12-minute timer, which is the customary amount of time to enjoy the sauna before taking a cold bath, as per Japanese customs. On the upper right side, there’s a reset button. Another notable aspect of this watch is its comfortable coil-style band, which is similar to those used for locker keys.
Pricing and Availability
You can currently purchase the black Casio Sauna Watch SAN100H-1B for $110 through the brand’s online store in the US. It seems that a second color option, the white and orange model SAN100H-7B, will be available in this market soon, maintaining the same retail price.
Casio, G-Central
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