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A&D Medical UT-103 Digital Thermometer

A&D Medical UT-103 Digital Thermometer

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  • ✔️ Detects fever accurately with thermistor sensor technology
  • ✔️ Suitable for oral, axillary, and rectal temperature measurement
  • ✔️ Audible beep signals when reading is complete
  • ✔️ Suitable for adults, children, and infants
  • ✔️ Affordable clinical-grade temperature monitoring at home

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What Is a Digital Thermometer and How Can It Help You?

 

Knowing whether you or someone in your family has a fever is one of the most important first steps in managing illness at home. The digital thermometer from A&D Medical — the UT-103 — gives you a fast, reliable temperature reading without any fuss. At just £2.49, it's one of the most accessible clinical tools you can keep in your medicine cabinet. The NHS recommends monitoring body temperature as part of assessing fever, particularly in children, where a high temperature can be an early warning sign of infection.

The A&D Medical UT-103 is a straightforward, single-use-probe-compatible thermometer designed for oral, axillary (underarm), or rectal measurement. It's compact, easy to read, and built to give you confidence when you need it most. If you're stocking up on home health essentials, you'll find it sits perfectly alongside other items in our first aid range.

 

How Does the A&D Medical UT-103 Thermometer Work?

 

The UT-103 uses a thermistor — a small electronic sensor at the probe tip — that changes its electrical resistance in response to heat. As body heat is detected, the device converts that resistance change into a precise temperature reading, displayed on a clear LCD screen. It's a well-established measurement principle used across clinical and home settings alike.

  • Switch the device on using the single button
  • Place the probe tip in the correct position (oral, axillary, or rectal)
  • Wait for the audible beep — typically within 60 seconds
  • Read the temperature displayed on the LCD screen
  • Clean the probe tip with an alcohol wipe before storing

 

Who Should Use the A&D Medical UT-103 Thermometer?

 

This thermometer is suitable for a wide range of users. Whether you're a parent checking a child's temperature at 2am or an adult monitoring your own health during a bout of flu, the UT-103 is designed to be simple enough for anyone to use correctly. The NHS advises that a temperature of 38°C or above in adults and children is considered a high temperature and warrants attention.

  • Adults monitoring fever during illness
  • Parents checking temperature in babies and young children (axillary use)
  • Carers managing temperature in elderly individuals
  • Anyone wanting a reliable home health monitoring tool

 

How Does the UT-103 Compare to Other Thermometer Types?

 

Feature A&D Medical UT-103 (Digital) Ear (Tympanic) Thermometer
Measurement site Oral, axillary, rectal Ear canal
Reading time ~60 seconds ~2–3 seconds
Price range £2.49 £15–£50+
Suitable for infants Yes (axillary) Limited (under 6 months)

 

Is the A&D Medical UT-103 Suitable for All Ages and Conditions?

 

The digital thermometer UT-103 is appropriate for most people, but there are a few things worth knowing. For babies under three months, the NHS recommends seeking medical advice promptly if any fever is detected, regardless of the reading. Rectal use should always be performed with a disposable probe cover and only when clinically appropriate — oral or axillary measurement is preferred for routine home use.

If you're managing a longer-term health condition and need to monitor temperature regularly alongside other vital signs, you might also want to explore our electrical health and diagnostic range for additional monitoring devices.

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.

A&D Medical UT-103 Digital Thermometer specifications
Treatment category Temperature monitoring / fever detection
Mechanism of action Thermistor sensor converts body heat to digital temperature reading
Effective for Detecting fever in adults, children, and infants (axillary)
Suitable for Adults, children, infants (axillary use)
Active ingredient N/A (medical device)
Pack size 1 thermometer
UK classification General sale medical device
Preparation Digital electronic thermometer
Route of administration Oral, axillary, or rectal

Specifications of A&D Medical UT-103 Digital Thermometer

 

What Is the A&D Medical UT-103 and What Is It Used For?

 

The A&D Medical UT-103 is a clinical digital thermometer used to measure body temperature in adults, children, and infants. It is primarily used to detect fever — defined by the NHS as a body temperature of 38°C or above — which can be a sign of infection or illness. It is a general sale medical device available without a prescription.

Temperature monitoring is a key part of assessing how unwell someone is. Whether you're tracking a child's fever through the night or checking your own temperature during a cold or flu episode, having a reliable thermometer at home means you can make more informed decisions about when to seek medical help.

 

What Do You Need to Know Before Using the A&D Medical UT-103?

 

The UT-103 is safe for most people to use, but there are some important points to be aware of before you start.

Do not use this thermometer if:

  • You are using it rectally without a disposable probe cover
  • The device is visibly damaged or the LCD screen is cracked
  • The battery is low (indicated by a low battery symbol on screen)
  • You are unsure of the correct measurement technique for infants under 3 months — seek advice from a health visitor or GP first

Warnings and precautions:

  • Do not leave the thermometer in direct sunlight or near heat sources, as this may affect accuracy
  • Allow the thermometer to reach room temperature before use if it has been stored in a cold environment
  • Do not eat, drink, or smoke for at least 15 minutes before taking an oral temperature reading
  • If a fever of 38°C or above persists for more than 3 days in adults, or any fever in a baby under 3 months, seek medical advice promptly

Known interactions:

  • No drug interactions — this is a medical device, not a medicine

 

How Should You Use the A&D Medical UT-103 Correctly?

 

Using the thermometer correctly is essential for getting an accurate reading. Follow these steps carefully each time.

  1. Wash your hands thoroughly before handling the thermometer
  2. Fit a disposable probe cover if one is available and you are using it orally or rectally
  3. Press the power button to switch the device on — the display will show a brief self-test
  4. Place the probe tip under the tongue (oral), in the armpit (axillary), or rectally as appropriate
  5. Hold the thermometer in position until you hear the beep signal
  6. Read the temperature displayed on the LCD screen
  7. Clean the probe tip with a 70% isopropyl alcohol wipe and allow to dry before storing
Measurement Site Age Group Typical Normal Range Notes
Oral Adults & children over 5 36.1°C – 37.2°C Most accurate for cooperative patients
Axillary (underarm) All ages including infants 35.5°C – 36.6°C Slightly lower than core temperature
Rectal Infants and young children 36.6°C – 38.0°C Closest to core temperature; use with care

If you're also managing cold or flu symptoms alongside a fever, our cold and flu range includes a variety of remedies to help you feel more comfortable while you recover.

 

What Are the Possible Side Effects of the A&D Medical UT-103?

 

As a medical device rather than a medicine, the UT-103 does not cause pharmacological side effects. However, there are a small number of device-related issues to be aware of.

Common issues:

  • Inaccurate readings if the probe is not correctly positioned
  • Slightly lower readings when using the axillary method compared to oral or rectal

Less common issues:

  • Mild skin irritation at the measurement site if the probe is held in place for an extended period
  • Device malfunction if the battery is depleted or the unit has been exposed to moisture

If you notice the thermometer consistently giving readings that seem implausible, replace the battery first. If the problem continues, discontinue use and contact A&D Medical.

 

How Should You Store the A&D Medical UT-103?

 

Correct storage keeps the thermometer accurate and extends its lifespan. Follow these simple guidelines.

  • Store in the protective case provided, in a cool, dry place
  • Keep away from direct sunlight and sources of heat
  • Do not store in the bathroom where humidity may affect the electronics
  • Keep out of reach of children when not in use
  • Remove the battery if the thermometer will not be used for an extended period
  • Store at temperatures between 10°C and 40°C

For families with young children, it's worth keeping the thermometer alongside other essentials in your baby and toddler health kit so it's always easy to find when you need it quickly.

Written and reviewed by our qualified team

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 A&D Medical UT-103 digital thermometer online in the UK?

You can buy the A&D Medical UT-103 digital thermometer directly from Cured Pharmacy online for just £2.49, with no prescription required. It is dispatched quickly to UK addresses and is one of the most affordable clinical thermometers available. It's a great addition to any home first aid kit.

How does the A&D Medical UT-103 digital thermometer work?

The UT-103 uses a thermistor sensor at the probe tip that detects changes in body heat and converts them into a precise digital temperature reading shown on the LCD screen. The process typically takes around 60 seconds and is signalled by an audible beep. It's the same core technology used in clinical settings, made accessible for home use.

How do I use the A&D Medical UT-103 step by step?

Switch the thermometer on, position the probe tip correctly — under the tongue, in the armpit, or rectally as appropriate — and hold it in place until you hear the beep. Read the temperature from the LCD display, then clean the probe with an alcohol wipe before storing. Always ensure the patient has not eaten or drunk anything hot or cold in the 15 minutes before an oral reading.

What is a normal temperature reading on a digital thermometer?

The NHS states that a normal body temperature is around 37°C, though this can vary slightly depending on the individual, time of day, and measurement site. A temperature of 38°C or above is considered a high temperature (fever) in both adults and children. Axillary readings tend to be slightly lower than oral or rectal readings.

Is the A&D Medical UT-103 suitable for babies and young children?

Yes, the UT-103 can be used for axillary (underarm) temperature measurement in babies and young children, which is the recommended method for infants. For babies under 3 months, the NHS advises seeking urgent medical advice if any fever is detected, regardless of the reading. Always use the thermometer gently and ensure the child is calm before measuring.

Who is eligible to use the A&D Medical UT-103 thermometer?

The UT-103 is suitable for adults, children, and infants when used correctly for the appropriate measurement site. It is available without a prescription as a general sale medical device. If you are caring for someone with a complex medical condition, speak to your GP or pharmacist about the most appropriate temperature monitoring method.

What should I do if the thermometer gives an inaccurate reading?

First, check that the probe is correctly positioned and that the patient has not eaten, drunk, or exercised in the 15 minutes before measurement. If readings remain inconsistent, replace the battery, as a low battery is a common cause of inaccurate results. If the problem persists after a battery change, discontinue use and contact A&D Medical.

What are the alternatives to the A&D Medical UT-103 digital thermometer?

Alternatives include ear (tympanic) thermometers, forehead (temporal) infrared thermometers, and non-contact infrared devices. Oral and rectal digital thermometers are generally considered the most clinically accurate for home use. You can browse a wider selection of monitoring devices in our electrical health and diagnostic collection.

How do I clean and maintain the A&D Medical UT-103?

Wipe the probe tip with a 70% isopropyl alcohol swab after every use and allow it to air dry completely before storing. Do not submerge the thermometer in water or use abrasive cleaning products, as these can damage the sensor. Store the device in its protective case in a cool, dry location away from direct sunlight.

What happens if I get a very high temperature reading — when should I call a doctor?

The NHS advises seeking urgent medical attention if an adult has a temperature above 39.5°C, or if a child under 3 months has any fever at all. You should also seek help if a fever lasts more than 3 days, or if it is accompanied by a rash, difficulty breathing, or severe headache. Do not rely solely on the thermometer reading — always consider the overall clinical picture.

How long does the battery last in the A&D Medical UT-103?

The UT-103 is powered by a standard button cell battery, which typically lasts for several hundred measurement cycles under normal use. A low battery indicator will appear on the LCD screen when the battery needs replacing. It is a good idea to keep a spare battery at home so you are never caught without a working thermometer when you need one most.

Can I use the A&D Medical UT-103 to take a rectal temperature?

Yes, the UT-103 is designed for oral, axillary, and rectal use, though rectal measurement should only be performed with a disposable probe cover and with appropriate care. Rectal temperature is generally considered the most accurate reflection of core body temperature, particularly in young infants. If you are unsure about the correct technique, speak to your health visitor or pharmacist before attempting rectal measurement.

How long can you use the A&D Medical UT-103 thermometer for?

With proper care and maintenance, the UT-103 can last for several years of regular home use. Replace the battery when the low battery indicator appears and clean the probe after every use to maintain accuracy. If the device shows signs of physical damage or consistently inaccurate readings, it should be replaced.

What are the latest guidelines on managing fever at home in the UK?

Current NHS guidance recommends monitoring temperature regularly during a fever, keeping the person hydrated, and using paracetamol or ibuprofen to manage discomfort where appropriate. You can find suitable fever and pain relief options in our pain relief collection. Always seek medical advice if a fever is very high, prolonged, or accompanied by other concerning symptoms.

Is the A&D Medical UT-103 waterproof?

The UT-103 is not designed to be fully waterproof or submersible, so you should avoid immersing it in water during cleaning. Clean the probe tip with an alcohol wipe rather than running it under a tap. Exposure to excessive moisture can damage the internal electronics and affect the accuracy of future readings.

How Should You Use the A&D Medical UT-103 Thermometer?

Using the UT-103 correctly is straightforward, but following the right steps each time ensures you get an accurate reading. Before you begin, make sure the probe tip is clean and the battery is charged. If you are taking an oral temperature, the patient should not have eaten, drunk, or smoked for at least 15 minutes beforehand.

What Is the Correct Dose of the A&D Medical UT-103 Thermometer?

This is a medical device, not a medicine, so there is no "dose" as such. However, the table below outlines the recommended measurement approach and normal temperature ranges by age group and measurement site. Understanding these ranges helps you interpret your reading accurately and decide whether medical attention is needed.

When Is the Best Time to Use the A&D Medical UT-103 Thermometer?

You can use the UT-103 at any time, but there are a few situations where timing matters. Avoid taking an oral temperature immediately after eating, drinking, or physical activity, as these can temporarily alter the reading. For the most consistent results, take the measurement when the patient has been resting quietly for at least 10–15 minutes.

If you are monitoring a fever over time, try to take readings at the same time each day — for example, morning and evening — so you can track any changes accurately. This is particularly useful when managing a child's illness and deciding whether to contact your GP.

How Long Can You Use the A&D Medical UT-103 Thermometer For?

The UT-103 is designed for long-term home use and can last for several years with proper care. Replace the battery when the low battery indicator appears on the LCD screen, and clean the probe after every use to maintain accuracy. If the device shows signs of physical damage, gives consistently implausible readings, or the display becomes difficult to read, it should be replaced.

There is no limit on how frequently you can use the thermometer — you can take multiple readings per day if needed during an illness. However, if you find yourself needing to monitor temperature very frequently over a prolonged period, this may be a sign that medical review is warranted.

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

How Should You Use the A&D Medical UT-103 Thermometer?

Using the UT-103 correctly is straightforward, but following the right steps each time ensures you get an accurate reading. Before you begin, make sure the probe tip is clean and the battery is charged. If you are taking an oral temperature, the patient should not have eaten, drunk, or smoked for at least 15 minutes beforehand.

What Is the Correct Dose of the A&D Medical UT-103 Thermometer?

This is a medical device, not a medicine, so there is no "dose" as such. However, the table below outlines the recommended measurement approach and normal temperature ranges by age group and measurement site. Understanding these ranges helps you interpret your reading accurately and decide whether medical attention is needed.

When Is the Best Time to Use the A&D Medical UT-103 Thermometer?

You can use the UT-103 at any time, but there are a few situations where timing matters. Avoid taking an oral temperature immediately after eating, drinking, or physical activity, as these can temporarily alter the reading. For the most consistent results, take the measurement when the patient has been resting quietly for at least 10–15 minutes.

If you are monitoring a fever over time, try to take readings at the same time each day — for example, morning and evening — so you can track any changes accurately. This is particularly useful when managing a child's illness and deciding whether to contact your GP.

How Long Can You Use the A&D Medical UT-103 Thermometer For?

The UT-103 is designed for long-term home use and can last for several years with proper care. Replace the battery when the low battery indicator appears on the LCD screen, and clean the probe after every use to maintain accuracy. If the device shows signs of physical damage, gives consistently implausible readings, or the display becomes difficult to read, it should be replaced.

There is no limit on how frequently you can use the thermometer — you can take multiple readings per day if needed during an illness. However, if you find yourself needing to monitor temperature very frequently over a prolonged period, this may be a sign that medical review is warranted.

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

What Are the Most Common Issues With the A&D Medical UT-103 Thermometer?

As a medical device rather than a medicine, the UT-103 does not cause pharmacological side effects. The most common issues users encounter are related to incorrect use or device maintenance rather than any inherent risk from the product itself. Being aware of these helps you get the most accurate results every time.

  • Inaccurate readings due to incorrect probe positioning
  • Lower-than-expected readings when using the axillary (underarm) method
  • Readings affected by eating, drinking, or exercise before oral measurement
  • Inconsistent results caused by a depleted battery

What Are the Less Common Issues With the A&D Medical UT-103 Thermometer?

Less frequently, users may encounter the following device-related issues. These are generally avoidable with correct storage and maintenance.

  • Mild skin irritation or discomfort at the measurement site if the probe is held in place for longer than necessary
  • Device malfunction following exposure to moisture or extreme temperatures
  • LCD display becoming difficult to read in very bright or very dim lighting conditions
  • Probe tip damage if the thermometer is dropped or stored without its protective case

What Are the Serious Concerns With the A&D Medical UT-103 Thermometer?

Serious safety concerns with this device are rare, but there are a few important points to keep in mind. Rectal use without a disposable probe cover carries a small risk of cross-contamination and should be avoided. Never use a damaged thermometer, as a cracked probe tip could cause injury. If the device is accidentally swallowed or causes injury, seek immediate medical attention.

It is also important to remember that the thermometer is a monitoring tool, not a diagnostic device. A normal reading does not rule out illness, and a high reading should always be interpreted alongside other symptoms.

What Should You Do If You Experience Problems With the A&D Medical UT-103?

If you notice the thermometer is giving readings that seem inconsistent or implausible, start by replacing the battery and ensuring the probe is correctly positioned. If problems continue, discontinue use and contact A&D Medical or speak to your pharmacist. Do not attempt to repair the device yourself.

If a fever reading prompts concern — particularly in a baby under 3 months, or if a fever exceeds 39.5°C in an adult — seek medical advice promptly rather than relying solely on repeated thermometer readings.

Can the A&D Medical UT-103 Thermometer Interact With Other Devices or Medicines?

As a medical device, the UT-103 does not interact with medicines. However, certain medications — such as antipyretics like paracetamol or ibuprofen — can lower body temperature, so readings taken after administering these medicines may not reflect the true peak fever temperature. If you are monitoring fever in someone taking antipyretics, note the time of the last dose alongside each temperature reading for a more accurate picture.

Strong electromagnetic fields from other electronic devices are unlikely to affect the UT-103 under normal home conditions, but it is good practice to keep the thermometer away from other electronic equipment during storage.

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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