The Apple Watch Ultra 2 has a water temperature sensor that operates within a specific range and has some limitations:
Temperature Range
- The water temperature sensor works in the range of 32° to 104° F (0° to 40° C)[1][3].Accuracy
- While exact accuracy specifications are not provided, the sensor is designed for recreational underwater activities like snorkeling and swimming, not for medical use[4].Response Time
- The sensor provides initial water temperature readings relatively quickly, in about 20-30 seconds after immersion[4].Environmental Factors
- The sensor can be influenced by the watch's exposure to body temperature when first submerged, leading to initial inaccuracies until the sensor stabilizes to the water temperature[4].Depth Limitations
- The Depth app on Apple Watch Ultra 2 is designed for use up to a maximum depth of 130 feet (40 meters). Going beyond this depth may cause some functions to stop working or work intermittently[5].In summary, while the water temperature sensor on the Apple Watch Ultra 2 is a useful feature for recreational activities, it has limitations in terms of operating temperature range, accuracy, response time, environmental factors, and depth limitations. It is not intended for medical use or precise health-related measurements.
Citations:[1] https://discussions.apple.com/thread/254354275
[2] https://support.apple.com/en-us/108766
[3] https://support.apple.com/en-in/111832
[4] https://support.apple.com/guide/watch-ultra/measure-underwater-temperature-duration-depth-apd9073c83d6/watchos
[5] https://support.apple.com/en-asia/102273
[6] https://discussions.apple.com/thread/254698233
[7] https://support.apple.com/en-al/102273
[8] https://support.apple.com/en-us/111832