Something else I’ve been meaning to point out, not many chest sensors are capable of accurately measuring heart rate variability.
Heart Rate variability is a great way of assessing your fitness and your fitness/health trends.
Look at the Elite Heart Rate Variability app and website. elitehrv.com
A snapshot of supported chest straps
The app is compatible with any heart rate monitor that accurately measures R-R intervals and has Bluetooth 4.0 or ANT+ (ANT+ only available for Android devices – see why ANT+ is not available for iOS here). The following HR monitors have proven to work well with the Elite HRV app:
Polar H7
Wahoo TICKR – Only Bluetooth is HRV accurate, ANT+ is just HR accurate
BlueLeza HRM Blue – Only available in Europe
4iiii Viiiiva
Zephyr HxM (make sure it’s Bluetooth 4.0, not 2.0!)
Cardiosport TP3
Suunto Smart Belt
ANT+ only (not compatible with iPhone or iPad)
Garmin Premium (for ANT+ compatible Android phones/tablets only)
Garmin HRM Tri (for ANT+ compatible Android phones/tablets only)