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OMRON MC520 Ear Thermometer

OMRON MC520 Ear Thermometer

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  • ✔️ Measures temperature in approximately one second via infrared tympanic technology
  • ✔️ Clinically validated for accurate fever detection in adults and children
  • ✔️ Colour-coded fever alert display for instant, clear temperature interpretation
  • ✔️ Hygienic single-use disposable probe covers included for every reading
  • ✔️ Suitable for children aged 3 months and over as well as adults

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Is the OMRON MC520 Ear Thermometer Right for You?

 

When someone in your household feels unwell, the last thing you want is a slow or unreliable temperature reading. The ear thermometer has become a household staple across the UK — and for good reason. The OMRON MC520 uses infrared tympanic technology to deliver a reading in roughly one second, making it one of the most practical options available for families, carers, and individuals managing their own health at home. At just £20.72, it sits in a sensible price range for a clinically validated device. You can browse the full range of home health monitoring tools in our Electrical Health and Diagnostic collection.

The NHS recommends using a digital thermometer to check for a high temperature, which it defines as 38°C or above in adults and children. Having a reliable device at home means you can act quickly — whether that's monitoring a child's fever overnight or checking your own temperature before deciding whether to seek medical advice.

 

How Does the OMRON MC520 Ear Thermometer Work?

 

The OMRON MC520 measures temperature via the tympanic membrane — the eardrum. This works because the eardrum shares a blood supply with the hypothalamus, the part of the brain that regulates body temperature. By detecting the infrared heat emitted from this area, the device can give a reading that closely reflects your core body temperature.

  • An infrared sensor inside the probe tip detects heat radiation from the tympanic membrane.
  • The device converts this infrared signal into a temperature reading within approximately one second.
  • A disposable probe cover sits over the tip to maintain hygiene between uses.
  • The result is displayed on a clear digital screen, typically with a colour-coded fever alert system.

 

Who Should Use the OMRON MC520 Ear Thermometer?

 

This device is designed for use in adults and children. It's particularly useful for parents who need to check a child's temperature quickly without disturbing them too much — a one-second reading is far less disruptive than other methods. It's also a practical choice for older adults, carers, and anyone who monitors their health regularly at home.

  • Adults monitoring their own temperature during illness
  • Parents checking children's temperatures during fever episodes
  • Carers supporting elderly or vulnerable individuals at home
  • Anyone who needs a fast, hygienic, and easy-to-use thermometer

It is not recommended for infants under 3 months of age. For very young babies, the NHS advises using a digital thermometer placed in the armpit instead. If you're managing a child's illness alongside other symptoms, our Cold and Flu collection has a range of supportive products worth exploring.

 

How Does the OMRON MC520 Compare to Other Thermometer Types?

 

Feature OMRON MC520 (Ear) Digital Oral/Axillary Thermometer
Measurement site Tympanic (ear canal) Mouth or underarm
Reading time ~1 second 60–90 seconds
Suitable for infants under 3 months No Yes (axillary)
Hygiene Disposable probe covers Requires cleaning between uses

 

Is the OMRON MC520 Ear Thermometer Clinically Suitable for Home Use?

 

Yes. The OMRON MC520 ear thermometer is a CE-marked medical device, meaning it meets European safety and performance standards. It is designed for non-professional home use and does not require a prescription. That said, a thermometer is a monitoring tool — it tells you what your temperature is, not what's causing it. If you or someone in your care has a persistently high temperature, or if a child under 3 months has any fever at all, seek medical advice promptly.

Accuracy can be affected by earwax build-up, incorrect probe positioning, or a very cold environment. Always allow the device to reach room temperature before use if it has been stored somewhere cold, and ensure the ear canal is clear before taking a reading.

This product is a medical device. Speak to your doctor or pharmacist before using if you have an underlying medical condition or are taking other medicines.

OMRON MC520 Ear Thermometer specifications
Treatment category Temperature monitoring / medical device
Mechanism of action Infrared tympanic measurement
Effective for Detecting fever in adults and children
Suitable for Adults and children (not recommended under 3 months)
Active ingredient N/A — medical device
Pack size 1 thermometer with probe covers
UK classification CE-marked medical device (OTC)
Preparation Handheld infrared thermometer
Route of administration Tympanic (ear canal)

Specifications of OMRON MC520 Ear Thermometer

 

What Is the OMRON MC520 and What Is It Used For?

 

The OMRON MC520 is a tympanic infrared ear thermometer intended for measuring body temperature in adults and children at home. It is used to detect fever — defined by the NHS as a temperature of 38°C or above — and to monitor temperature changes during illness. It is a medical device, not a medicine, and is available without a prescription.

Fever is a common symptom of many conditions, including infections, colds, and flu. Monitoring temperature at home helps you decide whether symptoms are worsening and whether medical attention is needed. If you're looking for products to help manage fever symptoms alongside temperature monitoring, our Pain Relief collection includes paracetamol and ibuprofen options suitable for adults and children.

 

What Do You Need to Know Before Using the OMRON MC520?

 

Before using this device, read the following carefully. While it is a straightforward home-use device, there are situations where extra caution is needed.

Do not use or use with caution if:

  • The user is an infant under 3 months of age — use an axillary digital thermometer instead, as advised by the NHS
  • There is significant earwax build-up or an active ear infection, as this may affect accuracy
  • The ear canal has recently been exposed to very cold or very hot temperatures
  • The device has been stored in a cold environment — allow it to reach room temperature first
  • The probe cover is missing, damaged, or has already been used — always fit a fresh cover before each reading

Known interactions:

  • No drug interactions — this is a medical device, not a medicine
  • Readings may be less accurate if the user has recently been swimming or has water in the ear canal

 

How Should You Use the OMRON MC520?

 

Using the OMRON MC520 correctly is essential for an accurate reading. Incorrect positioning is the most common reason for unreliable results with any tympanic thermometer.

  1. Wash your hands before handling the device.
  2. Attach a clean, unused probe cover to the tip of the thermometer.
  3. For adults and children over 1 year: gently pull the ear upward and backward to straighten the ear canal.
  4. For children under 1 year: gently pull the ear straight back.
  5. Insert the probe snugly into the ear canal — do not force it.
  6. Press the measurement button and hold still.
  7. Wait for the beep (approximately 1 second) and read the temperature on the display.
  8. Remove the probe and dispose of the used probe cover hygienically.
Indication Age Group Method Fever Threshold
Fever monitoring Adults Tympanic (ear) 38°C or above
Fever monitoring Children (1 year+) Tympanic (ear) 38°C or above
Fever monitoring Infants under 3 months Axillary (underarm) preferred Any fever — seek urgent advice

 

What Are the Possible Side Effects of the OMRON MC520?

 

As a non-invasive medical device, the OMRON MC520 does not cause systemic side effects. However, there are a small number of device-related issues to be aware of.

Common issues:

  • Inaccurate readings due to earwax obstruction
  • Inaccurate readings due to incorrect probe positioning
  • Mild discomfort if the probe is inserted too forcefully

Less common issues:

  • Error messages on the display if the probe cover is missing or the device is too cold
  • Inconsistent readings between ears — always use the same ear for comparison readings

If you notice persistent ear discomfort after use, stop using the device and consult your GP or pharmacist. Ear pain unrelated to thermometer use may indicate an underlying condition such as otitis media (middle ear infection) — your GP can advise on appropriate treatment.

 

How Should You Store the OMRON MC520?

 

Proper storage keeps the device accurate and extends its lifespan. Follow these guidelines:

  • Store at room temperature — avoid extremes of heat or cold
  • Keep away from direct sunlight and moisture
  • Store in the protective case provided when not in use
  • Keep probe covers in a clean, dry location and replace after every single use
  • Remove the battery if the device will not be used for an extended period
  • Do not store near strong electromagnetic fields or electronic equipment that may interfere with the sensor

For general health monitoring at home, you might also find our First Aid collection useful — it includes a range of products to help you manage minor illnesses and injuries confidently at home.

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Your safety and success are our highest priorities. Our medical team rigorously evaluates every product and piece of advice we provide, ensuring you receive only the most effective, science-backed solutions available.

Frequently Asked Questions

Where can I buy the OMRON MC520 ear thermometer online in the UK?

You can buy the OMRON MC520 ear thermometer directly from Cured Pharmacy online for £20.72, with fast UK delivery and no prescription required. It is a CE-marked medical device available over the counter. Simply add it to your basket and check out securely through our website.

How does an infrared ear thermometer work in the body?

An infrared ear thermometer detects heat emitted by the tympanic membrane — your eardrum — using an infrared sensor inside the probe tip. Because the eardrum shares a blood supply with the hypothalamus (the brain's temperature-regulating centre), it provides a reading that closely reflects your core body temperature. The OMRON MC520 converts this infrared signal into a digital temperature reading in approximately one second.

How do I use the OMRON MC520 ear thermometer step by step?

Attach a fresh probe cover, then gently pull the ear upward and backward (for adults and children over 1 year) to straighten the ear canal before inserting the probe snugly. Press the measurement button, wait for the beep, and read the temperature on the display. Always dispose of the used probe cover after each reading and never reuse one.

Is the OMRON MC520 suitable for babies and newborns?

The OMRON MC520 is not recommended for infants under 3 months of age, as the NHS advises using an axillary (underarm) digital thermometer for this age group instead. For babies aged 3 months and older, a tympanic ear thermometer can be used, but always follow the manufacturer's instructions carefully. If your baby under 3 months has any fever at all, seek urgent medical advice.

What temperature is considered a fever when using an ear thermometer?

The NHS defines a high temperature (fever) as 38°C or above in both adults and children. If your ear thermometer reading is at or above this threshold, you or your child may have a fever and you should monitor symptoms closely. Seek medical advice if the fever is very high, lasts more than a few days, or is accompanied by other concerning symptoms.

How accurate is the OMRON MC520 compared to other thermometers?

The OMRON MC520 is a clinically validated tympanic thermometer that provides accurate readings when used correctly. Accuracy can be reduced by earwax build-up, incorrect probe positioning, or using the device in a very cold environment — so always allow it to reach room temperature first. For the most consistent results, always take readings from the same ear and use a new probe cover each time.

What are the alternatives to the OMRON MC520 ear thermometer?

Alternatives include digital oral thermometers, axillary (underarm) thermometers, and forehead (temporal artery) thermometers. The NHS notes that digital thermometers placed in the mouth or armpit are reliable for most age groups, though they take longer to produce a reading than tympanic devices. You can explore a range of home health monitoring options in our Electrical Health and Diagnostic collection.

How long does the OMRON MC520 battery last?

The OMRON MC520 is designed to last for approximately 1,000 measurements per battery, though actual battery life will vary depending on how frequently you use the device and how it is stored. If the battery is running low, a low-battery indicator will appear on the display. Remove the battery if you plan to store the device unused for an extended period.

Can earwax affect the accuracy of my ear thermometer reading?

Yes — significant earwax build-up can block the infrared sensor from accurately detecting heat from the tympanic membrane, leading to a falsely low reading. The NHS notes that earwax build-up is a common and treatable condition. If you suspect earwax is affecting your readings, speak to your pharmacist about safe earwax removal options before relying on the thermometer result.

How do I clean and maintain the OMRON MC520 ear thermometer?

Always use a fresh disposable probe cover for each reading — this is the primary hygiene measure for this device. The exterior of the thermometer can be wiped with a slightly damp cloth; never immerse it in water or use alcohol-based cleaners directly on the probe tip. Store the device in its protective case when not in use to prevent dust and damage.

Who is eligible to use the OMRON MC520 ear thermometer?

The OMRON MC520 is suitable for adults and children aged 3 months and over for home temperature monitoring. It is particularly useful for parents, carers, and individuals who need a fast and hygienic way to check for fever. It is not suitable for infants under 3 months, and anyone with an active ear infection or significant earwax build-up should seek advice before use.

What should I do if my ear thermometer gives an error message?

An error message on the OMRON MC520 usually indicates that the probe cover is missing or damaged, the device is too cold (below its operating temperature range), or the probe was not positioned correctly in the ear canal. Check that a clean probe cover is attached, allow the device to reach room temperature, and retake the reading following the step-by-step instructions in the user manual.

How long can I use the OMRON MC520 ear thermometer for?

The OMRON MC520 is a durable home-use medical device with no set expiry date, provided it is stored and maintained correctly. Replace the battery when the low-battery indicator appears and always use fresh probe covers. If the device is dropped, damaged, or begins giving consistently unusual readings, stop using it and contact the manufacturer or your pharmacist for advice.

Can I use the OMRON MC520 if I have an ear infection?

Using a tympanic thermometer during an active ear infection is not recommended, as inflammation and fluid in the ear canal can affect the accuracy of the reading. The NHS advises seeking medical attention for ear infections, particularly in children. If you need to monitor temperature during an ear infection, consider using an axillary digital thermometer as an alternative — you can find related products in our Ear Nose Throat collection.

What are the latest guidelines on using ear thermometers for fever in children?

NICE guidance on fever in under-5s (NG143) recommends using an electronic thermometer for accurate temperature measurement in children. Tympanic thermometers are considered appropriate for children aged 3 months and over. The NHS advises that any child under 3 months with a temperature of 38°C or above should receive urgent medical assessment, regardless of the thermometer type used.

How Should You Use the OMRON MC520 Ear Thermometer?

Using the OMRON MC520 correctly is the single most important factor in getting an accurate reading. Incorrect probe positioning is the most common cause of unreliable results with any tympanic thermometer, so take a moment to follow these steps carefully every time.

Always allow the device to reach room temperature before use if it has been stored somewhere cold, and check that a clean probe cover is fitted before you begin.

What Is the Correct Dose of the OMRON MC520 Ear Thermometer?

This is a medical device, not a medicine, so there is no "dose" as such. However, the NHS recommends taking temperature readings consistently — using the same ear each time — to allow meaningful comparison between readings. If you are monitoring a fever, check temperature at regular intervals as advised by your GP or pharmacist.

The table below summarises recommended use by age group and the relevant fever thresholds according to NHS guidance.

When Is the Best Time to Use the OMRON MC520 Ear Thermometer?

Take a temperature reading when you or your child first shows signs of illness — feeling hot, shivering, flushed skin, or general malaise. Avoid taking a reading immediately after vigorous exercise, a hot bath, or if the person has been lying on one side for a prolonged period, as these can temporarily affect ear canal temperature.

If you are monitoring a fever over time, try to take readings at consistent intervals and note the results so you can share them with your GP or pharmacist if needed.

How Long Can You Use the OMRON MC520 Ear Thermometer For?

The OMRON MC520 has no set expiry date and is designed for long-term home use, provided it is stored and maintained correctly. Replace the battery when the low-battery indicator appears on the display, and always use fresh probe covers — these are single-use only and should never be reused between readings or between users.

If the device is dropped, physically damaged, or begins producing readings that seem inconsistent or implausible, stop using it and contact the manufacturer or your pharmacist for guidance. Regular cleaning of the exterior with a slightly damp cloth will help keep the device in good condition.

Do not exceed the recommended dose. If in doubt, speak to your pharmacist.

How Should You Use the OMRON MC520 Ear Thermometer?

Using the OMRON MC520 correctly is the single most important factor in getting an accurate reading. Incorrect probe positioning is the most common cause of unreliable results with any tympanic thermometer, so take a moment to follow these steps carefully every time.

Always allow the device to reach room temperature before use if it has been stored somewhere cold, and check that a clean probe cover is fitted before you begin.

What Is the Correct Dose of the OMRON MC520 Ear Thermometer?

This is a medical device, not a medicine, so there is no "dose" as such. However, the NHS recommends taking temperature readings consistently — using the same ear each time — to allow meaningful comparison between readings. If you are monitoring a fever, check temperature at regular intervals as advised by your GP or pharmacist.

The table below summarises recommended use by age group and the relevant fever thresholds according to NHS guidance.

When Is the Best Time to Use the OMRON MC520 Ear Thermometer?

Take a temperature reading when you or your child first shows signs of illness — feeling hot, shivering, flushed skin, or general malaise. Avoid taking a reading immediately after vigorous exercise, a hot bath, or if the person has been lying on one side for a prolonged period, as these can temporarily affect ear canal temperature.

If you are monitoring a fever over time, try to take readings at consistent intervals and note the results so you can share them with your GP or pharmacist if needed.

How Long Can You Use the OMRON MC520 Ear Thermometer For?

The OMRON MC520 has no set expiry date and is designed for long-term home use, provided it is stored and maintained correctly. Replace the battery when the low-battery indicator appears on the display, and always use fresh probe covers — these are single-use only and should never be reused between readings or between users.

If the device is dropped, physically damaged, or begins producing readings that seem inconsistent or implausible, stop using it and contact the manufacturer or your pharmacist for guidance. Regular cleaning of the exterior with a slightly damp cloth will help keep the device in good condition.

Do not exceed the recommended dose. If in doubt, speak to your pharmacist.

What Are the Most Common Issues With the OMRON MC520 Ear Thermometer?

Because the OMRON MC520 is a non-invasive medical device rather than a medicine, it does not cause systemic side effects. However, there are some common device-related issues that can affect your experience or the accuracy of your readings. Being aware of these helps you get the most reliable results every time you use it.

  • Inaccurate or falsely low readings due to earwax build-up blocking the infrared sensor
  • Inaccurate readings caused by incorrect probe positioning in the ear canal
  • Mild, temporary discomfort if the probe is inserted too firmly or at the wrong angle
  • Inconsistent readings between the left and right ear — always use the same ear for comparison

What Are the Less Common Issues With the OMRON MC520 Ear Thermometer?

Less frequently, users may encounter the following issues. Most of these are easily resolved by checking the device and following the instructions carefully.

  • Error messages on the display if the probe cover is missing, damaged, or incorrectly fitted
  • Readings that appear unusually high or low if the device has been stored in a very cold or warm environment
  • Battery-related errors causing the device to switch off mid-reading
  • Probe tip contamination if the device is not stored in its protective case

What Are the Serious Concerns With Using an Ear Thermometer?

Serious adverse events from using a tympanic thermometer are rare. However, there are a few situations that warrant prompt attention. If you experience persistent ear pain after using the device, this may indicate an underlying ear condition such as otitis media (middle ear infection) or otitis externa (outer ear infection) — neither of which is caused by the thermometer itself, but which may have been present beforehand. Do not attempt to self-treat ear infections; see your GP for assessment and appropriate management.

If the device gives a reading that seems implausibly high or low and you are concerned about someone's condition, do not rely solely on the thermometer result. Seek medical advice based on the full clinical picture, including symptoms and general appearance.

What Should You Do If You Experience Problems With the OMRON MC520?

If you are getting consistently unusual readings, first check that you are using a fresh probe cover, that the ear canal is clear of significant earwax, and that the device has reached room temperature. Retake the reading following the step-by-step instructions in the user manual. If problems persist, contact the OMRON customer support team or speak to your pharmacist, who can advise on whether the device needs replacing.

If you are concerned about a fever reading — particularly in a child under 5 or an infant — always seek medical advice promptly rather than relying solely on repeated thermometer readings.

Can the OMRON MC520 Ear Thermometer Interact With Other Devices or Medicines?

As a medical device, the OMRON MC520 has no pharmacological interactions with medicines. However, strong electromagnetic fields from nearby electronic equipment may theoretically interfere with the sensor — store and use the device away from such sources where possible. Certain ear drops or treatments for earwax may temporarily affect the ear canal environment and therefore the accuracy of readings; allow the ear to settle before taking a temperature measurement if you have recently used ear drops.

If you are concerned about any side effects, contact your pharmacist or GP immediately.

Patient Information Leaflet

Important - Before taking any medication, it is always important to read the Patient Information Leaflet (PIL)

Written and reviewed by our qualified team

GPhC Number: 2233073
Tarun Kumar

Reviewed by:

Tarun Kumar

Superintendent/ Clinical Lead

📖 Find out more about our team of medical content authors and how we ensure the accuracy of our content with our content guidelines.

Content last updated: 31 Mar 2025

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