Last year, Scanadu caught our attention with Scout, its simple-to-use tricorder-style health monitor. Now a new iPhone case promises to make monitoring your vital signs even easier. Called Wello, the case has sensors built in that can give you a picture of your overall health after holding it a special way for just a few seconds. The slim device measures your heart rate, blood pressure, temperature, and blood oxygen levels and displays the ECG waves from your heart -- you can even test your lung function through a small included attachment you blow into. Designed to be both fast and simple to use, the prototype we tried out this week was ultra-light, and thinner than the Speck case on one of our iPhones. Readings are done with your hands in a comfortable position, and the health tracker was able to return our vital signs as well as a fancy ECG graph of our heart in just a few seconds.