A new fitness band can tell you exactly how dehydrated you are and how much water to drink

In the same way your eye uses incoming light to create a visual image, the LVL band shines near-infrared light into your body, which then comes back to the band in the form of a spectroscopic image — essentially a fingerprint from inside your bloodstream. Software in the band analyzes that information to measure specific biometrics, like heart rate and hydration level.

Throughout the day, the LVL band gives wearers a small vibration to notify them when their hydration levels are getting low. A smartphone app that accompanies the band offers an estimated dehydration level, say "18% dehydrated," and advises you to drink a certain amount of water accordingly.

Over time, Freckleton says, the app will learn when you tend to exercise and go to bed and calibrate its recommendations based on those behavior patterns. For example, you might get a notification encouraging you to drink 12 ounces of water two hours before your regular workout time, so that you're in the best state possible to exercise.

Later that night, you might get another notification reminding you to drink 10 ounces before bed, to keep you hydrated as you go 6-8 hours without water.

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