Turn 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 while swimming. One of the measured parameters is turn time. Swimtraxx One tracks the rotational speed of every turn during your swim.
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!