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A thermometer is a common tool used to measure temperature. Many people use it at home, in clinics, hospitals, schools, and laboratories. Today, there are different types of thermometers, and each works in a slightly different way.
This guide explains how to read different thermometers, how they work, and what to know before you buy a thermometer in Australia. The information below is based on trusted health and science sources and written in clear, easy-to-understand language.
What Is a Thermometer?
A thermometer is a device used to measure temperature. In healthcare, it is often used to check body temperature. In laboratories, it may be used to measure liquids, air, or materials.
According to Australia’s health authorities, body temperature is usually measured in degrees Celsius (°C) .
How Does a Thermometer Work?
Most thermometers work by sensing changes in heat. When the temperature changes, the material inside the thermometer reacts. This reaction is then shown as a number on a screen or scale.
To learn more about how a thermometer works, read our detailed guide: How Does a Thermometer Work?
1. Electronic Thermometer (Digital Thermometer)
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An electronic thermometer, also called a digital thermometer, is one of the most common types used at home.
How an Electronic Thermometer Works
An electronic thermometer uses a small electronic sensor. When placed under the tongue, in the armpit, or rectally, the sensor detects heat. The thermometer then converts this heat into a digital number.
Studies show that digital thermometers are widely used in healthcare settings because they are easy to read and quick to use.
How to Read It
- Turn the thermometer on.
- Place it correctly (mouth, armpit, or rectum).
- Wait until the screen shows the number or until you hear the beep sound.
- Read and record the number shown on the screen.
Some product examples include Surgipack digital thermometer, which follows the same basic reading method.
2. Clinical Thermometer (Medical Use)
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A clinical thermometer is designed specifically for measuring human body temperature.
How a Clinical Thermometer Works
Modern clinical thermometers are usually digital or infrared. They detect heat from the body and display the result on a screen.
Health authorities note that proper placement and following instructions are important for accurate readings .
How It Works
Traditional clinical thermometers have a liquid (like mercury or another liquid) that moves up a tube when heat makes it expand.
Modern clinical thermometers are often digital and use a heat sensor like electronic thermometers.
How to Read It
For a digital clinical thermometer:
- Turn it on.
- Place it under the tongue, in the armpit, or as the instructions say.
- Wait for the beep.
- Read the number on the screen.
For a glass clinical thermometer:
- Place it in the measured spot (usually under tongue or in armpit).
- Wait until the liquid stops moving.
- Read the top of the liquid line for the temperature.
This type is usually made for the body temprature range of around 35°C to 42°C.
Examples people often search for include Surgipack thermometer and Braun thermometer 5, which are commonly used in home and clinical settings.
For a deeper look at clinical thermometers, see our blog: Exploring the Different Types of Clinical Thermometers
Laboratory Thermometer
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A laboratory thermometer is mainly used in schools, research labs, and industrial settings.
How a Laboratory Thermometer Works
Many laboratory thermometers are made of glass and contain liquid (such as alcohol). When the temperature increases, the liquid expands and moves up the scale.
According to science education resources, this type of thermometer is designed for materials and experiments, not for measuring body temperature .
How to Read It
- Hold the thermometer upright.
- Hold the thermometer in the substance you want to test.
- Wait a bit for the temperature to settle.
- Look at where the liquid is on the scale.
- Read the number where the liquid stops.
Battery in Thermometer: What You Should Know
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Why the Battery Matters
Digital thermometers use a small battery to power the sensor and display. A weak battery may cause slow readings or incorrect results.
Health device guidelines recommend replacing the battery when the screen becomes dim or readings seem inconsistent .
Some people look for examples like battery Vicks thermometer, which uses a standard coin battery.
How to Check and Change Thermometr Battery
- Look for a small battery door on the thermometer. You can often find it at the back or at the tip of the thermometer.
- Slide to open it carefully.
- Replace the battery with the correct size (often listed in the instructions).
How to Read Body Temperature Results (Simple Guide)
When using a therometer, it is important to understand what the numbers mean. Body temperature can look different depending on where the thermometer is used.
According to Australian health guidance, normal body temperature is usually around 36.5°C to 37.5°C, but this can change based on the measurement site and the person .
Normal Temperature Ranges by Body Area
Below are general temperature ranges commonly referenced in Australian healthcare guidance. These are guides only, not diagnoses.
| Body Area Measured | Normal Temperature Range (°C) |
|---|---|
| Mouth (oral) | About 36.5°C – 37.5°C |
| Armpit (axillary) | About 36.0°C – 37.0°C |
| Forehead (temporal) | About 36.3°C – 37.4°C |
| Ear (tympanic) | About 36.5°C – 37.8°C |
*Ranges are approximate and based on Australian hospital and health education guidance.
Why Readings Can Be Different
Temperature readings may change due to:
- Time of day
- Physical activity
- Room temperature
- Recent eating or drinking
- Battery condition in a digital thermometer
For this reason, health services recommend:
- Use the same thermometer
- Measure in the same body area
- Wait at least 15–30 minutes after eating or drinking
- Wait at least 20–30 minutes after exercise or physical activity
- Wait at least 30 minutes after a shower or bath
- Room temperature can affect readings, so wait at least 10-15 minutes before measuring
- Check that the thermometer battery is working properly.
- Follow the device instructions carefully
How to Choose the Right Thermometer
When planning to buy a thermometer, consider the following:
- Who will use it (adult, child, baby)
- Where it will be used (home, clinic, lab)
- Ease of reading
- Battery type and replacement
Australian consumer guidance suggests choosing thermometers that are easy to use and clearly labelled in Celsius. Talk to a pharmacist if you are unsure.
Best Thermometer Australia: General Tips
There is no single “best thermometer Australia” for everyone. The best choice depends on your needs.
For general home use:
- Digital electronic thermometers are commonly recommended.
- Clear displays and fast readings are helpful.
For learning or lab use:
- Laboratory thermometers are more suitable.
Always follow manufacturer instructions and official health guidance when using medical devices.
Quick Overview: How to Read Different Thermometers
| Thermometer Type | How It Works (Simple) | How to Read It | Common Use |
|---|---|---|---|
| Electronic Thermometer | Uses an electronic sensor to detect heat and turn it into a number | Place correctly, wait for beep, read number on screen | Home and general health use |
| Clinical Thermometer | Measures body heat using digital or infrared sensors | Follow instructions, wait for signal, read °C result | Clinics, hospitals, home medical use |
| Laboratory Thermometer | Liquid inside glass expands when temperature rises | Read number where liquid stops on scale | Schools, labs, research |
| Battery Thermometer | Battery powers the sensor and digital display | Replace battery if screen is dim or slow | Most digital thermometers |
Key Takeaways
- A thermometer measures temperature using heat detection
- Digital and clinical thermometers are best for body temperature
- Laboratory thermometers are not for medical use
- A low battery can affect digital thermometer readings
- Always read temperatures in degrees Celsius (°C) in Australia
Frequently Asked Questions (People Also Ask)
How does a thermometer work in simple terms?
A thermometer senses heat and turns it into a number you can read.
Can a low battery affect thermometer readings?
Yes. A weak thermometer battery may affect performance.
Is a laboratory thermometer safe for body temperature?
No. Laboratory thermometers are not designed for medical use.
Final Thoughts
Understanding how to read different thermometers helps people make better choices and use devices correctly. Whether you are looking to buy a thermometer for home use or learning purposes, knowing how each type works is important.
Always rely on trusted information, follow instructions, and choose products that suit your needs.
References & Sources
- Australian Government – Department of Health and Aged Care (Thermometers and temperature guidance)
- Royal Children’s Hospital Melbourne – Temperature measurement guidance
- NSW Health – Using thermometers safely and correctly
- Australian Academy of Science – Temperature and thermometers (education resources)
- Therapeutic Goods Administration (TGA) – Medical device battery and usage guidance
- Australian Consumer Guidance – Medical devices and home health equipment
