How to Take Temperature with Ear Thermometer | Correct Way

An ear thermometer reads the heat radiated by the eardrum, which sits deep inside the canal. If you aim wrong, move mid-read, or measure an ear full of wax, you get a number that doesn’t match how your child actually feels. The good news is that getting an accurate reading takes about two seconds once you know the right position. The steps below walk you through the method that medical professionals and the device manuals recommend.

How Do You Position An Ear Thermometer Correctly?

Position matters more than any other factor. The probe needs a straight, clear path to the eardrum — anything blocking that path skews the result. Start by gently pulling the outer ear to straighten the canal, then guide the probe in at the right angle.

• For adults: pull the top of the ear up and back.
• For children under about 12 months: pull the ear down and back.

Insert the probe tip just far enough to seal the opening — usually the tip sits at the canal entrance, not deep inside. Point the sensor straight at the eardrum, not at the canal wall. Many manuals specifically warn that angling the probe toward the wall produces a low reading.

Once the probe is seated, hold the thermometer perfectly still. Any movement during the read can drop the temperature reading by a noticeable margin. Wait for the beep or ready signal, then remove the device and read the display.

What Steps Should You Follow For An Accurate Reading?

The full correct sequence takes under a minute. Follow it in order, and you’ll get a number you can trust enough to act on.

1. Attach a clean probe cover to the tip. The cover must be new for each measurement — reusing one spreads germs and can leave residue that blocks the sensor.
2. Pull the ear to straighten the canal — up and back for adults, down and back for small children.
3. Insert the probe gently, aiming straight at the eardrum.
4. Hold the thermometer steady until it beeps, usually within 1–2 seconds.
5. Remove the thermometer and read the temperature on the display.
6. Discard the probe cover before storing the device.

Take every reading in the same ear. The left and right ears can differ by a small amount, so switching ears mid-illness can make a fever look like it came and went. Use the same ear, the same direction, and roughly the same depth each time. That consistency gives you a trend you can compare over hours.

What Causes Inaccurate Ear Thermometer Readings?

Most bad readings come from one of a handful of common mistakes, and nearly all of them are avoidable. The biggest culprit is aiming the probe at the canal wall instead of the eardrum. A close second is measuring too soon after the ear or the thermometer changed temperature.

Wait at least 30 minutes if the thermometer or the ear was exposed to a different temperature environment — coming in from a cold car, being near a heater, or using a warm compress all count. Don’t use the thermometer while ear drops or other ear medication are in use; if only one ear has drops, measure the untreated ear instead.

Excess earwax also scatters the infrared signal, producing a reading that runs low. If your child has visible wax blocking the canal, an ear thermometer may not be the right tool that day. And never force the probe in — the tip should sit gently at the canal opening. Pushing deep risks touching the eardrum, which is painful and can damage it.

For a quick visual reference of common errors and fixes, this short summary covers the main trouble spots:

If you’re shopping for a reliable model for a newborn, our tested roundup of ear thermometers for newborns compares the models that perform best on tiny ears.

How Do You Clean And Care For An Ear Thermometer?

Good care keeps the sensor accurate and the device hygienic. Clean the probe tip with a soft, dry cloth or a cotton swab lightly dampened with alcohol. Never submerge the thermometer in water or run it under a faucet — these devices are not waterproof.

Brands like Braun and Philips recommend wiping the lens after each use and storing the device in its protective case. Check the manual for your specific model’s cleaning guidance, since some use special caps that need periodic replacement. Keeping the sensor free of debris is as important as using a fresh probe cover each time.