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Numark Flexitip Digital Thermometer

Numark Flexitip Digital Thermometer

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  • ✔️ Flexible tip design for comfortable use in all ages
  • ✔️ Accurate temperature readings in approximately 60 seconds
  • ✔️ Suitable for oral, axillary, and rectal measurement
  • ✔️ Audible beep alerts when reading is complete
  • ✔️ Memory function retains last recorded temperature reading

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

 

Knowing your body temperature matters more than most people realise. Whether you're worried about a child running a fever or trying to monitor your own symptoms during a bout of cold or flu, having a reliable digital thermometer at home can make a real difference. The Numark Flexitip Digital Thermometer is a straightforward, affordable device designed to give you accurate temperature readings quickly — all for just £3.99. It's the kind of essential you want in your medicine cabinet before you actually need it, not after. You'll find it alongside other useful health monitoring tools in our Electrical Health and Diagnostic collection.

The NHS recommends checking body temperature when you suspect a fever, particularly in young children where high temperatures can escalate quickly. A normal body temperature sits at around 37°C, and anything at or above 38°C is generally considered a fever in adults and children alike. This thermometer gives you that information clearly, without fuss.

 

How Does the Numark Flexitip Digital Thermometer Work?

 

The mechanism is simple but effective. Inside the flexible tip sits a thermistor — a type of temperature-sensitive resistor — that detects heat from the body and converts it into an electrical signal. That signal is then processed and displayed as a numerical temperature reading on the LCD screen. The whole process takes roughly 60 seconds or less.

  • The flexible tip conforms gently to body contours, reducing discomfort during use
  • An audible beep signals when the reading is complete
  • The LCD display shows the temperature in degrees Celsius
  • A memory function retains the last recorded reading for easy reference
  • Auto-off function preserves battery life when not in use

 

Who Should Use the Numark Flexitip Digital Thermometer?

 

This thermometer is suitable for a wide range of users. Its flexible tip makes it particularly well-suited to use with young children and infants, where a rigid probe could cause discomfort. That said, it works just as well for adults monitoring their own temperature at home.

  • Parents monitoring fever in babies, toddlers, and older children
  • Adults tracking symptoms during illness, including cold and flu
  • Carers supporting elderly or vulnerable individuals at home
  • Anyone wanting a reliable, low-cost temperature monitoring device

If you're managing a child's illness and need additional support products, our Baby and Toddler collection includes a range of relevant items to help.

 

How Does the Numark Flexitip Compare to Other Thermometer Types?

 

Feature Numark Flexitip Digital Thermometer Infrared Ear Thermometer
Price £3.99 £15–£40+
Reading time ~60 seconds ~1–2 seconds
Suitable for infants Yes (axillary use) Not recommended under 6 months
Measurement sites Oral, axillary, rectal Ear canal only

 

Is the Numark Flexitip Digital Thermometer Clinically Suitable and How Should It Be Stored?

 

The digital thermometer is a Class IIa medical device and meets the requirements set out under UK medical device regulations. It does not contain mercury, making it safer for home use than older glass thermometers. Store it in its protective case, away from direct sunlight, extreme temperatures, and moisture. Keep it out of reach of children when not in use.

Do not use the thermometer if the display is cracked, the tip is damaged, or the battery is low — all of these can affect reading accuracy. Replace the battery (typically LR41 or equivalent) as soon as the low battery indicator appears.

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.

Numark Flexitip Digital Thermometer specifications
Treatment category Temperature monitoring / fever detection
Mechanism of action Thermistor sensor detects body heat and converts to digital reading
Effective for Measuring oral, axillary, and rectal body temperature
Suitable for Adults, children, and infants
Active ingredient N/A — medical device
Pack size 1 thermometer
UK classification Medical device (Class IIa)
Preparation Electronic digital thermometer with flexible tip
Route of administration Oral, axillary (armpit), or rectal

Specifications of Numark Flexitip Digital Thermometer

 

What Is the Numark Flexitip Digital Thermometer and What Is It Used For?

 

The Numark Flexitip Digital Thermometer is a non-invasive medical device 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 — and to monitor temperature changes during illness. It can be used orally (under the tongue), axillary (in the armpit), or rectally, depending on the age and preference of the user.

Fever is one of the body's natural responses to infection. Monitoring it at home helps you decide whether symptoms are worsening and whether medical attention is needed. The NHS advises seeking urgent medical help if a baby under three months has a temperature of 38°C or above, or if a child between three and six months reaches 39°C or higher.

 

What Do You Need to Know Before Using the Numark Flexitip Digital Thermometer?

 

This is a medical device rather than a medicine, so there are no drug interactions or contraindications in the traditional sense. However, there are important precautions to be aware of before use.

Do not use this thermometer if:

  • The tip or casing is visibly cracked or damaged
  • The battery is depleted — this can cause inaccurate readings
  • You intend to use it rectally in a premature infant without medical guidance
  • The user has recently eaten, drunk, or exercised — wait at least 15 minutes before taking an oral reading

Additional warnings:

  • Do not share the thermometer between users without thorough cleaning between uses
  • Do not use in the ear — this device is not designed for tympanic (ear) measurement
  • Keep out of reach of children when not in use — small parts and battery present a choking hazard
  • Do not expose to extreme heat, cold, or moisture

There are no known drug interactions as this is a non-medicinal device.

 

How Should You Use the Numark Flexitip Digital Thermometer?

 

Using this thermometer correctly is key to getting an accurate reading. Follow these steps carefully each time.

  1. Wash your hands thoroughly before handling the thermometer
  2. Clean the tip with an alcohol swab and allow it to dry completely
  3. Press the power button to switch the device on — the display will show a brief self-test
  4. Place the flexible tip in the chosen measurement site (see table below)
  5. Hold still and wait for the audible beep, which signals the reading is complete
  6. Read the temperature displayed on the LCD screen
  7. Switch off the device and clean the tip again before storing
Measurement Site Age Group Method Normal Range
Axillary (armpit) Infants and young children Place tip in armpit, hold arm against body 36.4°C–37.2°C
Oral (under tongue) Children over 5 and adults Place tip under tongue, close mouth 36.1°C–37.2°C
Rectal Infants (under medical guidance) Insert tip gently into rectum no more than 1.5 cm 36.6°C–38.0°C

If you're also managing cold or flu symptoms alongside a fever, our Cold and Flu collection has a range of products that may help.

 

What Are the Possible Side Effects of the Numark Flexitip Digital Thermometer?

 

As a medical device, the Numark Flexitip Digital Thermometer does not cause systemic side effects. However, improper use can occasionally lead to minor localised issues.

Common issues associated with use:

  • Mild discomfort at the measurement site if the tip is held in place for too long
  • Inaccurate readings if the device is used incorrectly or the battery is low
  • Skin irritation at the axillary site in individuals with sensitive skin

Less common concerns:

  • Minor mucosal irritation if the oral tip is not cleaned between uses
  • Rectal discomfort if inserted too deeply or without adequate lubrication

If you notice any persistent discomfort or skin reaction, discontinue use and consult your pharmacist or GP.

 

How Should You Store the Numark Flexitip Digital Thermometer?

 

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

  • Store in the protective case provided, in a cool, dry location
  • Keep away from direct sunlight and sources of heat
  • Do not store in the bathroom where humidity can affect the electronics
  • Keep out of reach of children at all times
  • Replace the battery promptly when the low battery indicator appears
  • Do not store near strong electromagnetic fields or magnets

For other home health essentials, browse our First Aid collection for a full range of products to keep your household prepared.

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 Numark Flexitip Digital Thermometer online in the UK?

You can buy the Numark Flexitip Digital Thermometer directly from Cured Pharmacy online for just £3.99, with no prescription required. It is dispatched quickly and discreetly to your home address. It is also available in some high street pharmacies, though online purchasing is often more convenient and cost-effective.

How does the Numark Flexitip Digital Thermometer work?

The thermometer uses a thermistor sensor embedded in its flexible tip to detect body heat and convert it into a digital temperature reading displayed on the LCD screen. The flexible tip is designed to conform gently to body contours, making the measurement process more comfortable. An audible beep signals when the reading is complete, usually within around 60 seconds.

How do I use the Numark Flexitip Digital Thermometer step by step?

Switch the device on, clean the tip with an alcohol swab, and place it in the appropriate measurement site — under the tongue, in the armpit, or rectally depending on the user's age. Hold still and wait for the beep before reading the temperature on the display. Always clean the tip again after use and store the thermometer in its protective case.

What is a normal body temperature reading on a digital thermometer?

The NHS states that a normal body temperature is approximately 37°C, though this can vary slightly depending on the individual and the measurement site used. A temperature of 38°C or above is generally considered a fever in both adults and children. If you are concerned about a high temperature, particularly in a young baby, seek medical advice promptly.

Is the Numark Flexitip Digital Thermometer suitable for babies and newborns?

Yes, the flexible tip design makes it suitable for use in infants and young children, particularly via the axillary (armpit) method which is recommended for babies. For newborns and premature infants, always consult a healthcare professional before using the rectal method. You can find other products for young children in our Baby and Toddler collection.

How accurate is the Numark Flexitip Digital Thermometer?

When used correctly, the Numark Flexitip Digital Thermometer provides clinically reliable temperature readings. Accuracy can be affected by recent physical activity, eating, drinking, or bathing, so it is advisable to wait at least 15 minutes before taking a reading in these circumstances. A low battery can also reduce accuracy, so replace it promptly when the indicator appears.

What is the best time to take a temperature reading with a digital thermometer?

The best time to take a temperature reading is when the person has been resting quietly for at least 15 minutes and has not recently eaten, drunk anything hot or cold, exercised, or bathed. Body temperature naturally fluctuates throughout the day, typically being slightly lower in the morning and higher in the late afternoon. Taking readings at consistent times can help you track changes more reliably.

How do I clean the Numark Flexitip Digital Thermometer between uses?

Wipe the flexible tip thoroughly with a cotton swab or pad soaked in isopropyl alcohol (rubbing alcohol) or a mild antiseptic solution after every use. Allow the tip to dry completely before storing or reusing. Do not submerge the thermometer in water or use abrasive cleaning materials, as these can damage the sensor and casing.

What are the alternatives to the Numark Flexitip Digital Thermometer?

Alternatives include infrared tympanic (ear) thermometers, non-contact forehead infrared thermometers, and temporal artery thermometers. Each type has different speed, accuracy, and suitability characteristics — for example, ear thermometers are faster but not recommended for babies under six months. The Numark Flexitip offers a cost-effective, versatile option suitable for most household needs.

Can I use the Numark Flexitip Digital Thermometer in the ear?

No — the Numark Flexitip Digital Thermometer is not designed for tympanic (ear canal) measurement and should not be used in the ear. It is intended for oral, axillary, or rectal use only. Using it in the ear could result in inaccurate readings and potential discomfort.

Who is eligible to use the Numark Flexitip Digital Thermometer?

The thermometer is suitable for use in adults, children, and infants of all ages, making it a versatile choice for family households. It is available over the counter without a prescription. If you are caring for someone with a complex medical condition and need to monitor temperature regularly, speak to your GP or pharmacist for tailored advice.

How long does the battery last in the Numark Flexitip Digital Thermometer?

Battery life varies depending on frequency of use, but the auto-off function helps conserve power when the device is not in use. A low battery indicator on the display will alert you when the battery needs replacing. The thermometer typically uses a standard LR41 or equivalent button cell battery, which is widely available.

What should I do if my child has a high temperature?

The NHS advises that if a baby under three months has a temperature of 38°C or above, or a child aged three to six months reaches 39°C or higher, you should seek urgent medical attention. For older children with a fever, keep them cool, ensure they drink plenty of fluids, and consider appropriate fever-reducing medicines such as paracetamol or ibuprofen as directed. You can also explore our Cold and Flu collection for supportive products.

How long can I use the Numark Flexitip Digital Thermometer for?

The thermometer can be used indefinitely as long as it remains in good working condition, the tip is undamaged, and the battery is functioning correctly. Inspect the device regularly for signs of wear, cracks, or damage to the casing or tip. Replace the thermometer if any damage is detected, as this can compromise reading accuracy.

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

Current NHS guidance recommends monitoring temperature regularly during illness and seeking medical advice if a fever is very high, persistent for more than five days, or accompanied by other concerning symptoms such as a rash, difficulty breathing, or severe headache. NICE clinical guidelines also support the use of digital thermometers as a reliable method for home temperature monitoring. Always follow the most up-to-date NHS advice and consult a healthcare professional if you are unsure.

How Should You Use the Numark Flexitip Digital Thermometer?

Using the thermometer correctly ensures you get an accurate, reliable reading every time. Before you begin, make sure the tip is clean and the battery is sufficiently charged — a low battery can affect the accuracy of your results. Follow these steps each time you take a temperature reading.

What Is the Correct Dose of the Numark Flexitip Digital Thermometer?

This is a medical device, not a medicine, so there is no "dose" in the traditional sense. However, the correct measurement method varies depending on the user's age and the site being used. The table below outlines the recommended approach for each group.

When Is the Best Time to Use the Numark Flexitip Digital Thermometer?

For the most accurate reading, take the temperature when the person has been resting quietly for at least 15 minutes. Avoid measuring immediately after eating, drinking hot or cold liquids, exercising, or bathing, as all of these can temporarily alter body temperature. Body temperature also fluctuates naturally throughout the day — it tends to be slightly lower in the morning and higher in the late afternoon — so taking readings at consistent times helps you track changes more meaningfully.

If you are monitoring a fever during illness, checking temperature at regular intervals (such as every four to six hours) gives you a clearer picture of whether it is rising, stable, or improving.

How Long Can You Use the Numark Flexitip Digital Thermometer For?

The thermometer can be used for as long as it remains in good working condition. There is no set expiry date for the device itself, but you should inspect it regularly for signs of damage to the tip, casing, or display. Replace the battery as soon as the low battery indicator appears, as a depleted battery can lead to inaccurate readings. If the tip becomes cracked or the display is damaged, replace the thermometer entirely rather than continuing to use it.

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

What Are the Most Common Issues Associated With Using the Numark Flexitip Digital Thermometer?

As a medical device rather than a medicine, the Numark Flexitip Digital Thermometer does not cause systemic side effects. However, there are some common issues that can arise from incorrect or repeated use. Being aware of these helps you get the most accurate results and avoid unnecessary discomfort.

  • Mild discomfort at the measurement site if the tip is held in place for an extended period
  • Inaccurate temperature readings due to incorrect placement of the tip
  • Inaccurate readings caused by a low or depleted battery
  • Skin irritation in the axillary area in individuals with particularly sensitive skin

What Are the Less Common Concerns With the Numark Flexitip Digital Thermometer?

Less commonly, some users may experience minor issues related to hygiene or technique. These are generally avoidable with proper care and correct usage.

  • Mild mucosal irritation if the oral tip is not cleaned adequately between uses
  • Rectal discomfort if the tip is inserted too deeply or without appropriate lubrication
  • Condensation or moisture damage to the device if stored in a humid environment such as a bathroom

What Are the Serious Concerns to Be Aware of With This Device?

Serious adverse events from using a digital thermometer are rare, but there are a few important safety points to keep in mind. Do not use a damaged thermometer — a cracked tip or broken casing can cause injury or produce unreliable readings. If the thermometer is used rectally in a premature infant without medical guidance, there is a risk of mucosal injury. Always follow the manufacturer's instructions and seek medical advice if you are unsure about the appropriate measurement method for a vulnerable individual.

Additionally, never rely solely on a home thermometer reading to make clinical decisions. If you are concerned about a high or persistent fever, always seek professional medical advice.

What Should You Do If You Experience Problems With the Numark Flexitip Digital Thermometer?

If you notice persistent skin irritation, discomfort, or suspect the device is giving inaccurate readings, stop using it and consult your pharmacist. If the thermometer has been used incorrectly — for example, inserted too deeply rectally — and you are concerned about injury, seek medical attention promptly. For general queries about temperature monitoring or fever management, your GP or pharmacist can provide tailored advice.

Can the Numark Flexitip Digital Thermometer Interact With Other Devices or Medicines?

As a non-medicinal device, the Numark Flexitip Digital Thermometer has no known drug interactions. However, strong electromagnetic fields — such as those produced by certain medical equipment — may theoretically interfere with the electronic components. In a clinical setting, always follow the guidance of healthcare staff regarding the use of personal medical devices. There are no known interactions with medicines, supplements, or other over-the-counter products.

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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