The Aqua Pulse heart rate monitor allows aquatic sports people to keep track of their exertion in a fairly non-intrusive method. The unit slides under your goggle strap and the electrode clips to your ear lobe to measure your pulse. The computer in the Aqua Pulse then speaks your pulse to you via bone conduction so you can continue to train without disruption.
There are different measurement periods and programmes and the rechargeable battery is good for 8 hours of continuous use. AU$249 down under but shop around.
The new Aqua Pulse HRM has been created specifically for swimmers. Its water proof design changes both how the heart rate is sensed and how the heart rate is transmitted to the user. All functions are integrated into one small unit that the user clips on to their goggle strap and rests on their temple.