Today’s thermometers can take temperatures in more places than ever. The options start with the traditional oral (‘under the tongue’), rectal and axillary approaches. In general, the axillary approach is considered the least accurate, rectal the best, and the oral approach somewhere in between the two. Note that rectal is usually for infants, and that if you plan to use the thermometer via this method, you should also purchase a separate one for oral use, and avoid using the same thermometer for both places.
Beyond these traditional methods for taking a temperature, additional options exist. These include tympanic via the ear, and also via the skin of the forehead. In fact, the latest thermometers can measure the temperature without ever coming into contact with the person, known as a contactless thermometer.
With a digital thermometer, be sure to pay attention to the display. Features to look for include a display with a larger readout, and also one that lights up, which can be ideal for taking a temperature at night in the dark.
Another deciding factor for a thermometer is how quickly the temperature can be obtained. Most are pretty fast these days, but it can still range from a few minutes to just a mere second. Digital ear thermometers (aka: tympanic thermometers) are known for their rapidness in measurement, a very useful feature with an uncooperative child unlikely to keep an oral thermometer under their tongue for the time required for an accurate reading.
Rather than dedicating each thermometer to a single family member, there are options today to have a single thermometer safely shared between multiple members of the household. The first option is to look for a thermometer that can accept a probe cover. These are a simple plastic sleeve that can protect the thermometer, and gets pulled off and tossed after each use. Another plus is that many are universal and can be used with thermometers of multiple manufacturers making this an affordable option. Yet, another option is to go the disposable route, and simply toss the thermometer after each use for the ultimate in convenience.