(Image credit: Apartment Therapy )

Tinké plugs into any compatible iOS device and converts your smart device into a fitness and health monitoring tool to track heart, blood oxygen level, stress levels, and respiratory rate at the touch of your thumb [video below]. The device works by using an optical sensor to measure blood volume changes inside your thumb, revealing cardiovascular health and stress levels (didn't know your thumbs were so revealing, did you?). If you're already using a fitness monitor like the Nike+ Fuelband, Jawbone Up, or Fitbit (or a smart weight scale), this plug-in device could be a great complementary tool for tracking hopefully your healthiest year yet.