It's always useful to be able to measure your temperature, especially when the world is in the throws of a pandemic where early signs of a fever could be mean getting help or not.
Kinsa is a US company that make thermometers with an app, they state their mission is "to stop the spread of infectious disease by knowing where and when it starts" and they have a HeathWeather map (currently seems to be US only).
There are two thermometers, one is an in ear device and the one reviewed here is inserted orally, under the arm or rectally (not tested). It has a flexible stem with a metal tip, which connects to a round top which contains the electronics, battery (CR2032) and a display which has a backlight.
The companion app is available on iOS and Android and allows multiple profiles for different users. The device must be paired with the app before use.
The backlight is quite bright which makes it quite difficult to show the display, but it can display in Centigrade or Fahrenheit which is set through the app.
It's really easy to use, just push the button and 3 dashes will appear on the display and then insert in to the relevant orifice. Within a short time the temperature will be read and appear on the display and in the app where it can be assigned to a user and the temperatures displayed as a timeline that can be shared with health professionals.
The thermometer is fully FDA approved.
It's available online directly through the Kinsa Health store for a very reasonable $24.99 (though can be cheaper on big shopping sites that will ship to the UK).