Health & Fitness
How Fitness Tracker Sensors Work: Accelerometers, PPG, and Skin Temperature Explained
Understand how fitness tracker sensors like accelerometers, PPG, and skin temperature work, and learn to distinguish between direct measurements and algorithmic estimates. This guide helps you interpret your data, knowing that trust in metrics decreases the further they are from raw sensor signals.
Kai Kealoha·October 23, 2026
