Earlier, we mentioned in-ear optical HRMs. They're neat because they're built into sports headphones, so you essentially get two devices for the price of one. While these devices cost a lot more than other HRMs, they're a good value if you're also in the market for a new pair of wireless sports headphones. And let's not forget fitness trackers and smartwatches. Many go beyond basic heart rate monitoring with the ability to take an electrocardiogram (ECG) to assess your heart rhythm for signs of atrial fibrillation (AFib)—an irregular heart rhythm that can lead to serious health problems. That list includes the Fitbit Charge 6, the Apple Watch Series 9, and the Samsung Galaxy Watch 6, among others.