We've all heard the case for ditching the old-school bathroom scale: Your weight can fluctuate, it doesn't account for body composition (muscle vs. fat), you could be retaining water depending on your workout, menstrual cycle etc., and, really, it only measures your body's relation to gravity (which isn't a direct reflection of fitness).
But the fact remains that it's a great way to gauge progress if you're trying to lose a significant amount of weight. And, although body fat measuring devices are a great idea, they can be seriously inaccurate. (BTW, here are 10 other ways to watch your progress).
Enter: the new Naked 3D Fitness Tracker, a mirror more magical than the one in Snow White. While it won't tell you who the fairest is in the kingdom, it will tell you how you're fairing with your fitness goals. How it works: The full-length mirror is equipped with Intel RealSense Depth Sensors (using infrared light similar to your TV remote). You stand on a scale-like turntable, which spins you so the sensors can do a 3D scan of your body in just 20 seconds. The data is then delivered to an app that lets you track your body's changes over time, including a real-time "heat map" that shows where your body is gaining muscle or accumulating fat. Bonus: Its super sleek design actually adds to your bedroom or bathroom, instead of being something you'd rather hide.
The device is about as accurate as a water displacement body fat test, meaning it'll get your fat percentage accurate to within 1.5 percent, said Farhad Farahbakhshian, Naked Labs CEO and founder, in an interview with Mashable. Farahbakhshian has been beta-testing the device with real people since 2015, and you can officially pre-order now for $499; however, orders won't ship until March 2017 (meaning you have about a year to give one of these other advanced fitness trackers a try).