 | Wearables that count steps and track heartbeats are a dime a dozen these days, but now some new health gadgets are aiming to look inside the body in new ways, to track everything from hydration to hemoglobin levels. The device works by sending different wavelengths of light into the body, and then measuring how much of that light is absorbed, Rymut told Live Science. Another product on display here at CES, called Ember, from the California-based company Cercacor, is a noninvasive hemoglobin tracker for athletes.
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