This smart brush tells you if your hair is healthy The Kérastase Hair Coach is a hairbrush that connects to an app on your phone. Facebook Prev Article Next Article Gadgets Checkout these cool gadgets... Related Posts The Coolest Christmas Card Hand Crank Generator – Charge Your Devices In Remote Places Mini Yacht + Jet Ski = Jet Taxi It’s an Electric Bike on Water 3D-printed attachment turns any smartphone into a DNA-scanning microscope Glowforge 3D Laser Printer Can Create Objects with Leather, Fabric, Paper and More