Understand sensors and fitness jargon
- All fitness trackers have a combination of accelerometers and gyroscopes to detect motion. Some will add altimeters and barometers to measure elevation or how many stairs you’ve climbed in a day.
- Nearly all modern trackers have a photoplethysmography (PPG) sensor - green LEDs that shine light through your skin to measure heart rate. There are also an increasing number of trackers that include red LEDs or SpO2 sensors to measure blood oxygen levels.
- If you see a tracker has EKG capabilities, that means it has an electrode.
- Some fitness trackers will also opt for built-in GPS. Others will use your
phone’s GPS.
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