The Apple Watch Ultra 2 features a water temperature sensor that operates within a temperature range of 32° to 104° F (0° to 40° C). While specific accuracy details for the temperature sensor are not explicitly stated in the available documentation, it is designed to provide readings suitable for recreational underwater activities such as snorkeling and swimming.
Sensor Performance
- Response Time: The temperature sensor in the Apple Watch Ultra 2 is noted to provide readings relatively quickly, with initial temperature readings taking approximately 20-30 seconds after immersion in water[5].
- Environmental Influence: It's important to note that the water temperature readings may be influenced by the watch's exposure to body temperature when it is first submerged. This could lead to initial inaccuracies until the sensor stabilizes to the water temperature[4].
- Not for Medical Use: The temperature sensing feature is not intended for medical purposes, which implies that while it can provide useful data for recreational activities, it should not be relied upon for precise health-related measurements[2].
In summary, while the Apple Watch Ultra 2's water temperature sensor is designed for recreational use and provides reasonably quick readings, factors such as initial body temperature and the lack of detailed accuracy specifications should be considered when evaluating its precision.
Citations:[1] https://support.apple.com/guide/watch-ultra/measure-underwater-temperature-duration-depth-apd9073c83d6/watchos
[2] https://support.apple.com/en-in/111832
[3] https://support.apple.com/en-al/102273
[4] https://discussions.apple.com/thread/254698233
[5] https://forum.suunto.com/topic/8945/water-temperature-how-fast-does-it-show-the-correct-temperature
[6] https://discussions.apple.com/thread/255080576
[7] https://www.reddit.com/r/AppleWatch/comments/1ej9g1w/how_does_the_apple_watch_ultra_2_do_such_a_good/
[8] https://www.youtube.com/shorts/YBEFh2ZQ9L8