The ithlete sensors are the best around, independently validated for accuracy, convenient and durable. Some users don’t get the hang of taking measurements right away, so to ensure you don’t waste any time follow the tip tips found here.
Try to find a consistent time of day when you can do your HRV reading uninterrupted and with a minimum of external influences, and you will be rewarded with more sensitive and accurate recommendations!
Few people who use or follow wearable tracking tech will have failed to hear that Fitbit is facing multiple lawsuits in the US alleging a lack of accuracy in the heart rate (HR) monitoring function of devices such as the Fitbit Surge ™ and Charge HR™. Here is a summary of the research examining these claims.