Underwater time is an interesting parameter to measure while swimming. Swimtraxx has developed a device that offers to do so besides tracking many other swim specific parameters.
Swimtraxx One tracks tons of data that is translated into real-time valuable insights. One of the measured parameters is underwater time. Swimtraxx One tracks your time under water. Because every breakout counts it helps you get a clear view of your hypoxic effort for every lap.
Swimtraxx One gets clicked onto the side of your swimming goggles and tracks all the data while being in the water.
With Swimtraxx One you can easily keep track of your swimming workout routine. You can look up all registered data on the Swimtraxx App at any time.
Check out https://www.swimtraxx.com/#features for more info.