The overall Which? test score is made up of the following star ratings, all determined by our rigorous lab tests.
How we test ease of use
To see whether a thermometer is easy to use, we rate aspects such as how simple it is to set up, how clearly readings are displayed on the screen, how easy it is to take your own temperature and how easy it is to take a child's temperature.
How we test consistency
How consistent was the temperature result when a user measured it.
How we test comfort
How comfortable the thermometer feels in the hand and for the person it's being used on.
How we test convenience
To determine the convenience score, we rate aspects such as how quickly the thermometer returns a temperature reading, how clear and complete the instructions are, and how suitable it is for use on young children.