We used FlowBio to track our hydration at the 2024 London Marathon - Wareable
Briefly

Wearables like FlowBio's S1 sensor utilize microfluidic technology to track hydration levels through sweat, aiding athletes in optimizing fluid intake during activities like running and cycling.
The FlowBio S1 sensor captures liquid through sweat and employs electrochemical sensors to measure fluid and sodium loss, crucial for athletes to replenish electrolytes during intense exercise.
Read at Wareable
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