How do I know if my infrared thermometer is accurate
James Bradley
Updated on April 18, 2026
To test the accuracy of an infrared thermometer requires access to a stable surface of a known temperature. You cannot verify the accuracy of an IR thermometer by comparing it to an immersion type thermometer that is beneath the surface of a liquid or semi-solid in a non-controlled experiment.
How do I make sure my infrared thermometer is accurate?
The best way to control the emissivity and temperature of a surface, ensuring that you get the true reading of an infrared thermometer, is by using a solid black body. This minimises most external factors and prevents the temperature from changing too quickly.
What is a normal forehead temperature with an infrared thermometer?
It would be normal to read an actual forehead skin surface temperature between 91F and 94F if using a general-purpose infrared thermometer. Some infrared thermometers have an “adjustable emissivity feature”. Some are factory set for emissivity of 0.95, or in the case of our IRFS, 0.97.
Do Infrared thermometers need to be calibrated?
Infrared thermometers cannot typically be calibrated at home, but they are known for their low drift. If the results of your ice bath test are within your unit’s manufacturer’s listed specification, you are good to go.How do I test an infrared thermometer?
These thermometers are also used to measure the temperatures of surfaces and objects. Press the’ MODE’ button to select between Body / Object or Body / Surface to measure the temperature. Set the thermometer in Body mode to measure the temperature.
Is forehead or ear temperature more accurate?
Rectal temps are the most accurate. Forehead temps are the next most accurate. Oral and ear temps are also accurate if done properly. Temps done in the armpit are the least accurate.
How reliable are non-contact thermometers?
Research has shown that, when used correctly, infrared or no-contact thermometers are just as accurate as oral or rectal thermometers. No-contact thermometers are popular among pediatricians, as kids often squirm around when trying to get a temperature read, but it also holds true in mass temperature screenings.
What forehead temperature is too low?
Hypothermia is a medical emergency, which if left untreated can lead to brain damage and cardiac failure. Body temperature below 95°F (35°C) is considered abnormally low, and the condition is known as hypothermia.What is considered a fever with an infrared thermometer?
Read the thermometer screen. Temperature is less than 35°C, take temperature again. Temperature is 38°C or higher, this person has a fever.
What is the temperature reading for Covid 19?The most common symptoms are new: continuous cough. fever/high temperature (37.8C or greater) loss of, or change in, sense of smell or taste (anosmia)
Article first time published onHow accurate is a forehead temp?
An armpit (axillary) temperature is usually 0.3°C (0.5°F) to 0.6°C (1°F) lower than an oral temperature. A forehead (temporal) scanner is usually 0.3°C (0.5°F) to 0.6°C (1°F) lower than an oral temperature.
Can you take your own temperature with a forehead thermometer?
Temporal artery temperature Temporal artery thermometers use an infrared scanner to measure the temperature of the temporal artery in your forehead. Turn on the digital thermometer. Gently sweep it across your forehead and read the number.
How can I tell if I have a fever with my forehead thermometer?
Touching the forehead Touching a person’s forehead with the back of the hand is a common method of telling whether or not they have a fever. If the person has a fever, their forehead may feel very hot. This can be inaccurate, but it may provide some general information.
How do you calibrate a non contact thermometer?
This can be achieved in a few different ways. However, the simplest way to help calibrate a non-contact thermometer is to create an ice bath for the thermometer to measure. Luckily, this can be done by using a large glass rather than having to fill up an entire bathtub.
Is 99.2 a fever on forehead?
Everyone’s body runs at a slightly different normal temperature, but the average is 98.6 degrees Fahrenheit, and anything above 100.9 F (or 100.4 F for children) constitutes a fever.
Why is my neck temperature higher than forehead?
The temperature is measured on the lateral side of neck, which lies closer to large arteries (carotid artery) than do the temporal arteries of the forehead region. Thus, neck IFR measures closely reflect axillary temperatures.
Why do we take temperature on forehead?
In the age of COVID, our forehead will become the target of fever spot checks. Thermal cameras and non-contact infrared thermometers will get deployed in an effort to prevent people with a fever from entering into an area where they may infect others. … Our forehead emits heat in the form of infrared radiation.
Why do I feel hot but my temperature is low?
People may feel hot without a fever for many reasons. Some causes may be temporary and easy to identify, such as eating spicy foods, a humid environment, or stress and anxiety.
Is 97.5 a good temperature?
Normal body temperature ranges from 97.5°F to 98.9°F (36.4°C to 37.2°C). It tends to be lower in the morning and higher in the evening. Most healthcare providers consider a fever to be 100.4°F (38°C) or higher. High fevers may bring on seizures or confusion in children.
Why do I feel like I have a fever but my temperature is low?
Feeling feverish or hot may be one of the first signs of having a fever. However, it’s also possible to feel feverish but not be running an actual temperature. Underlying medical conditions, hormone fluctuations, and lifestyle may all contribute to these feelings.
Which thermometer is best for Covid?
No-touch or non-contact infrared thermometers measure temperature through the forehead from a close distance in seconds. They may be used on newborns and older people. They’re easy to use and may reduce the risk of spreading disease by allowing more physical distancing.
Is temperature testing for Covid effective?
Of note, the United States Food and Drug Administration (FDA) released a statement in June 2020 noting that non-contact temperature assessment devices “are not effective if used as the only means of detecting a COVID-19 infection” [16].
What are the first few symptoms of Covid?
Early symptoms reported by some people include fatigue, headache, sore throat or fever. Others experience a loss of smell or taste. COVID-19 can cause symptoms that are mild at first, but then become more intense over five to seven days, with worsening cough and shortness of breath.
Where is the best place to take your temperature?
- Oral: For this method, the thermometer is placed under the tongue. …
- Rectal: For this method, the thermometer is inserted gently into the rectum. …
- Axillary: For this method, the thermometer is placed in the armpit for young children or adults whose temperature can’t safely be done orally.
What is the most accurate forehead thermometer?
The Braun Digital No-Touch Forehead Thermometer was by far the best we tested. This thermometer guides you through the entire temperature-taking process with directions conveniently printed right on the front of the thermometer.
Where is the best place to take your temperature with a digital thermometer?
A digital thermometer is best for taking temperatures by the armpit and mouth. Fever strips and pacifier thermometers do not give an accurate temperature. Do not use a mercury thermometer. Mercury is toxic and the thermometer could break.