The Smartphone Temperature Sensor from Thermodo is a tiny electrical thermometer for your smartphone. It lets you take the temperature anywhere and at any time through the audio port of your phone. The accompanying free iOS or Android app is calibrated to covert the audio input coming in from the sensors into temperature and display it on the screen. The Thermodo is made of aluminum and comes in pitch black with an industrial grade paint finish. There’s also a premium version that’s made of anodized aluminum with a finish that makes it look like the surface of a MacBook. Both versions have the Thermodo logo stamped on. The logo on the black Thermodo is handstamped, while the premium one has electrode erosion engraved logos.