Last year, we tried out the Kinsa Smart Thermometer. The $30 device had no display and needed to be inserted into your phone’s headphone jack before being stuck under your kid’s tongue to get a reading. Recently, the company released a smarter ear thermometer. This one has a screen, eliminating the need for your phone. However, it does use Bluetooth to pair with an iOS or Android app to help you keep track of your family’s health.