Athletes can use information from sweat to prevent fatigue before it starts.

These four pads change color to measure chloride, glucose, pH, and lactate.

A channel fills with sweat to gauge water loss.

These indicators provide information about hydration status and electrolyte balance,

as well as the total amount of water lost to sweat.

The ability to quickly and easily measure these things with a phone is a huge improvement

over the previous, lab-bound technologies for sweat monitoring.

The sensor is rugged and flexible enough to move -- even during strenuous exercise.

It may also have medical uses in the future, like tracking blood sugar without the need

to collect blood.

This smart little sensor is probably the first thing

that actually wants to be around your sweat!