The Fitbit Versa 4 is water-resistant up to 50 meters, which is equivalent to a 5 ATM rating. This level of water resistance makes it suitable for shallow swimming, such as in a pool or during casual water activities like showering or light swimming in freshwater[1][2][8]. However, it is not designed for high-pressure water activities like scuba diving or using hot tubs/spas with water jets[8].
While the Versa 4 can track swimming exercises and is meant to be used during swimming sessions, its water resistance is not sufficient for deep-water activities. The device's water resistance can also be affected by factors such as exposure to chemicals from soap, shampoo, sunscreen, or other substances, and it may diminish over time or due to physical impacts[2].
For scuba diving or high-pressure water sports, devices with much higher water resistance ratings are recommended. For example, the Apple Watch Ultra 2 has a WR100 rating, allowing it to withstand depths of up to 328 feet and making it suitable for recreational scuba diving[7]. Therefore, the Fitbit Versa 4 is not suitable for scuba diving or similar high-pressure activities.
Citations:[1] https://fitstraps.co.uk/blogs/news/is-my-fitbit-waterproof-everything-you-need-to-know
[2] https://screenrant.com/fitbit-versa-4-waterproof-rating-explained/
[3] https://www.oceanicworldwide.com/us/media/wysiwyg/manuals/12-2283-r04.pdf
[4] https://prelaunch.com/product-blog/fitbit-sense-2-vs-versa-4
[5] https://www.heartratemonitorsusa.com/products/fitbit-versa-4-smartwatch
[6] https://community.fitbit.com/t5/Versa-4/Can-I-wear-my-Versa-4-while-swimming/td-p/5407923
[7] https://www.pcmag.com/picks/the-best-waterproof-fitness-trackers
[8] https://community.fitbit.com/t5/Versa-4/Versa-4-water-proof-for-swimming/td-p/5446406