This do-it-all device is a big upgrade from your standard bathroom scale. Step on the Withings Smart Body Analyzer ($150, withings.com) to get readings of your body weight, BMI, and body fat percentage along with resting heart rate, a good indicator of overall fitness. The scale also monitors indoor air quality, including room temperature and CO2 levels, and syncs all its data with your iOS and Android devices via Bluetooth or a wireless internet connection.
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