To help you select the best thermometer for your needs, we test thermometers for accuracy (on a nonfeverish adult) and repeatability (whether the same temperature is achieved over a few tries). We also evaluate features and accessories that improve performance.
When you or someone you care for gets sick, it's important to know if a fever has set in—and if so, how high. Running a temperature for more than three days, for example, is a sign that it's time to talk to your doctor, and temperatures above 104° F can cause seizures in young children. That’s why having a good thermometer that provides accurate readings is key.