Thermometers: How to choose the right tool for the job (2024)

Thermometers: Understand the options

Thermometers come in a variety of styles. Understand the different types of thermometers and how to pick the right thermometer for you.

By Mayo Clinic Staff

Choosing the thermometer that's best for your family can be confusing. Here's what you need to know about the most common thermometers.

Types of thermometers

In general, there are two types of thermometers. Touch, or contact, thermometers must touch the body in order to measure temperature. Remote, or no contact, thermometers can measure body temperature without touching the skin.

Contact thermometers

The most common kind of contact thermometer uses electronic heat sensors to record body temperature. These thermometers can be used on the forehead, mouth, armpit or rectum. Most electronic thermometers have a digital display that shows you the temperature reading.

Rectal temperatures provide the most-accurate readings for infants, especially those 3 months or younger, as well as children up to age 3. Temperatures taken from the armpit are usually the least accurate. For older children and adults, oral readings are usually accurate — as long as the mouth is closed while the thermometer is in place.

The pros:

  • Most electronic contact thermometers can record temperatures from the forehead, mouth, armpit or rectum — often in less than one minute.
  • An electronic contact thermometer is appropriate for newborns, infants, children and adults.

The cons:

  • Parents may worry about causing discomfort when taking a child's temperature rectally.
  • You need to wait 15 minutes after eating or drinking to take an oral temperature. Otherwise, the temperature of your food or drink might affect the thermometer reading.
  • It can be difficult for children — or anyone who breathes through the mouth — to keep their mouths closed long enough to get an accurate oral reading.

If you plan to use an electronic contact thermometer to take both oral and rectal temperatures, get two thermometers and label one for oral use and one for rectal use. Don't use the same thermometer in both places.

Remote thermometers

Many schools, businesses and health care settings are screening visitors for fever. A remote thermometer that doesn't require skin contact allows people to remain further apart. Remote thermometers can be used on the forehead (temporal artery) or the ear (tympanic).

Temporal artery thermometers

Remote forehead thermometers use an infrared scanner to measure the temperature of the temporal artery in the forehead.

The pros:

  • A remote temporal artery thermometer can record a person's temperature quickly and are easily tolerated.
  • Remote temporal artery thermometers are appropriate for children of any age.

The cons:

  • A temporal artery thermometer may be more expensive than other types of thermometers.
  • This type of thermometer may be less accurate than other types. Direct sunlight, cold temperatures or a sweaty forehead can affect temperature readings. Variations on user technique, such as holding the scanner too far away from the forehead, also may affect accuracy.

Tympanic thermometers

Remote ear thermometers, also called tympanic thermometers, use an infrared ray to measure the temperature inside the ear canal.

The pros:

  • When positioned properly, infrared ear thermometers are quick and generally comfortable for children and adults.
  • Infrared ear thermometers are appropriate for infants older than age 6 months, older children and adults.

The cons:

  • Infrared ear thermometers aren't recommended for newborns.
  • Earwax or a small, curved ear canal can interfere with the accuracy of a temperature taken with an infrared ear thermometer.

Mercury thermometers

Once a staple in most medicine cabinets, mercury thermometers use mercury encased in glass to measure body temperature. Mercury thermometers are no longer recommended because they can break and allow mercury — which is toxic — to escape.

If you have a mercury thermometer, don't throw it in the trash. Contact your local trash collection program to see if there's a hazardous waste collection site in your area.

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Jan. 11, 2023

  1. Yamanoor NS, et al. Low-cost contact thermometry for screening and monitoring during the COVID-19 pandemic. IEEE. 2020; doi:10.1109/IEMTRONICS51293.2020.9216444.
  2. Cherry JD, et al., eds. Fever: Pathogenesis and treatment. In: Feigin and Cherry's Textbook of Pediatric Infectious Diseases. 8th ed. Elsevier; 2019. https://www.clinicalkey.com. Accessed Oct. 26, 2020.
  3. Mercury thermometers. Environmental Protection Agency. https://www.epa.gov/mercury/mercury-thermometers. Accessed Oct. 26, 2020.
  4. Ward MA. Fever in infants and children: Pathophysiology and management. https://www.uptodate.com/contents/search. Accessed Oct. 26, 2020.
  5. How to take your child's temperature. American Academy of Pediatrics. https://www.healthychildren.org/English/health-issues/conditions/fever/Pages/How-to-Take-a-Childs-Temperature.aspx. Accessed Oct. 26, 2020.
  6. Mogensen CB, et al. Forehead or ear temperature measurement cannot replace rectal measurements, except for screening purposes. BMC Pediatrics. 2018; doi:10.1186/s12887-018-0994-1.
  7. Hayward G, et al. Non-contact infrared versus axillary and tympanic thermometers in children attending primary care: a mixed-methods study of accuracy and acceptability. British Journal of General Practice. 2020; doi:10.3399/bjgp20X708845.
  8. Aw J. The non-contact handheld cutaneous infra-red thermometer for fever screening during the COVID-19 global emergency. Journal of Hospital Infection. 2020; doi:10.1016/j.jhin.2020.02.010.

See more In-depth

See also

  1. Alcoholic hepatitis
  2. COVID-19 and vitamin D
  3. Coronavirus disease 2019 (COVID-19)
  4. COVID-19: How can I protect myself?
  5. Herd immunity and respiratory illness
  6. COVID-19 and pets
  7. COVID-19 and your mental health
  8. COVID-19, cold, allergies and the flu
  9. COVID-19 drugs: Are there any that work?
  10. COVID-19 in babies and children
  11. Coronavirus infection by race
  12. COVID-19 travel advice
  13. COVID-19 vaccines for kids: What you need to know
  14. COVID-19 vaccines
  15. COVID-19 variant
  16. COVID-19 vs. flu: Similarities and differences
  17. COVID-19: Who's at higher risk of serious symptoms?
  18. Debunking coronavirus myths
  19. Dehydration
  20. Different COVID-19 vaccines
  21. Excessive sweating
  22. Fever
  23. Fever: First aid
  24. Fever treatment: Quick guide to treating a fever
  25. Fight coronavirus (COVID-19) transmission at home
  26. Flu: When to see a doctor?
  27. Headache
  28. How do COVID-19 antibody tests differ from diagnostic tests?
  29. How to take your temperature
  30. How well do face masks protect against COVID-19?
  31. Is hydroxychloroquine a treatment for COVID-19?
  32. Kawasaki disease
  33. Long-term effects of COVID-19
  34. Mayo Clinic Minute: You're washing your hands all wrong
  35. Mayo Clinic Minute: How dirty are common surfaces?
  36. Multisystem inflammatory syndrome in children (MIS-C)
  37. Myelin oligodendrocyte glycoprotein antibody-associated disease (MOGAD)
  38. Post COVID syndrome
  39. Pregnancy and COVID-19
  40. Safe outdoor activities during the COVID-19 pandemic
  41. Safety tips for attending school during COVID-19
  42. Sex and COVID-19
  43. Toxoplasmosis
  44. Treating COVID-19 at home
  45. Unusual symptoms of coronavirus
  46. X-ray

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Thermometers: How to choose the right tool for the job (2024)
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