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 Human Hoist – Tool That Every Mechanic Deserves Walkbot The Nug – Micro knife on steroids No Matter How Rough the Seas, This Self-Leveling Pool Table Remains Balanced The Most Awesome Camera Stabilizer Optimus Organic LED Keyboard