Hitachi has developed a wristwatch, which can measure the wearer's health conditions such as pulse, moves and body temperature. The monitoring wristwatch can send the data wirelessly via the Internet to remote monitoring services.
Hitachi aims to productize the wireless wristwatch within 3 years, targeting the health care service industry for elderly people.
More details on Tech-On.

Mio offers a line of strapless heart rate monitor wristwatches.

The Mio Shape Select monitors the heart rate with a patented technology. By placing two fingers on the MioSensors located on the wristwatch face the ECG accurate heart rate is measured. The Mio Shape Select watches are not continuously measuring the heart rate like watches with straps do, but sure is more comfortable. Besides heart rate the Mio watch is also tracks calories burned during exercise.

Buy Mio Shape Select Strapless Heart Rate Monitor