Here are examples of heart monitors that you can select from:
Accurate ECG Monitors with chest straps – Heart monitors that come with the chest straps are usually not the most accurate of heart monitors. The chest strap is tied around your chest, a few inches below your chest. It contains a device that can detect the electrical activity of your heart and transmit to the brain of the machine – as an ECG. The results are displayed on the monitor display, which most often is attached to your wrist like a watch. Others, however, prefer the results must be transmitted through audio messages via earphones.
The choice monitors with chest straps, you need to remember to keep the strap constantly connected to your body so you want to monitor the heart to produce erroneous readings.
Finally, the only alternative against buying heart monitors with chest straps are those that rely on pulses on your fingertips. However, these do not provide readings as accurate as those with chest straps.