We test devices for step-count accuracy and heart rate accuracy. That means there’s some degree of imprecision. They use sensors and algorithms to track steps taken, stairs climbed, hours slept, and even heartbeats. If you’re walking, running, or engaging in some other outdoor workout, having a bright display that you can read in the sunlight is key. But what’s important is being able to read that display while you’re exercising. Newer and more expensive models may have a high-resolution color screen. ![]() Most trackers reveal their data-using words, numbers, symbols, and graphics-on a watchface-like display. Make sure the band fits well because a tracker that’s too loose on your wrist can deliver inaccurate information. You can find models that feature a variety of materials, shapes, and colors, with some allowing you to replace the band with something more stylish to wear for a night on the town. In the past, fitness trackers tended to look purely functional, but manufacturers are now more conscious of style. Here are some of the features to consider when making your choice. Once you’ve decided whether you need a tracker or a smartwatch, you can refine your options based on personal preferences. Information from a fitness tracker can even be shared with your doctor. When charted on a mobile app or a website, the measurements from these sensors can give you insight into your daily habits and long-term trends.Ī tracker can also provide motivational support, from a simple vibrating alert when it’s time to get up from your desk, to challenges, badges, and interactions with online friends and family members who use a similar device. Barometer to determine your altitude, not just how far above sea level you are but also how many flights of stairs you climbed this morning to get to your office.GPS to track your location and map your route while you’re out on a ride or a run.Gyroscope or other positional sensors to determine whether you’re standing, sitting, reclining, swimming, cycling, etc.Once reserved for smartwatches, this feature is starting to pop up in trackers. Blood oxygen tracker to monitor how well your body is using oxygen, a metric that can be useful in sleep tracking.Heart rate monitor to track your pulse during exercise and throughout the day. ![]() Most trackers have an accelerometer or other sensors to help measure your steps and other up-down, side-to-side, and front-to-back movements. ![]() On higher-end models it can include more sophisticated metrics like sleep-tracking info and even detection of abnormal heart rhythms. The data varies by tracker but likely begins with basic information like the number of steps you’ve taken and your heart rate while you’re exercising. They usually sync wirelessly with a smartphone app that stores this information. All fitness trackers use a variety of sensors to monitor your movements as well as health metrics like your heart rate.
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