Measure air temperature accurately with Testo's measuring technology

Air temperature
measurement is one of the most frequent applications in the broad spectrum of temperature measurement. Because people as well as goods and products sometimes react very sensitively to temperature values that are too high or too low.

Examples of the places where an air temperature measuring device is used therefore include residential and office buildings, as well as storage areas for temperature-sensitive goods.


A Testo air temperature measuring device offers you the following

  • Measure air temperature with a comprehensive selection of probes for every requirement
  • Particularly robust construction with intuitive operation
  • Calibration and service from one source – with reliable Testo brand quality.

Products for air temperature measurement

Air temperature meters

Air temperature meters

Highlight: Smart Probe

Highlight: Smart Probe

How do you want to measure? Our air temperature measuring devices at a glance

With permanently fitted probes

Measure air temperature
For fast measurements under similar conditions.

With connectable probes

Air temperature meter
For more flexibility with measurement and for uses under changing conditions.

With App

Air temperature measurement

State of the art – without a cable, but with an App instead: the Testo Smart Probes.
Professional tools in a compact format.

Practical kits

Practical kits
With our kits, you’ll be ready to start straight away!

With App

Practical kits

Air temperature probes

Air temperature sensor
Comprehensive selection for virtually every application. Customized products are also possible.

All temperature probes

All temperature probes
Which temperature probe are you interested in?

Applications for your new air temperature meter

How to contact us.

Do you have any questions?
We would be more than happy to help you.

Air probes
Air temperature

Probes for air temperature measurement

Air probes are particularly suitable for measuring the air temperature, for instance in refrigerated counters, chest freezers or air conditioning systems (air output temperature), in the ventilation field (air input/output) or in the meteorological field.

The air temperature sensor of these probes is exposed and therefore particularly readily accessible to the air flow. You achieve an optimum result with your air temperature meter when you move the probe through the air at 2 – 3 m/s.

Physical backgrounds for air temperature

Temperature is the physical quantity most often measured after time. The temperature of a body is a measure for the energy of the subordinate movement of particles this body is made of. When thermal energy is supplied to this body, its particle speed increases. In turn, this leads to the temperature of the body rising. If energy is taken from a body, then the particle speed slows down and the temperature falls.

Physical backgrounds for air temperature

Celsius, Fahrenheit and Kelvin

Temperature is generally specified in Kelvin (K) and, for everyday use, measured in degrees Celsius (°C).

  • At 0°C and 273.15 K water freezes to ice, at 100°C and 373.15 K water boils
  • In the USA and some other countries temperature is still measured in degrees Fahrenheit (°F) today
  • In the Fahrenheit scale the ice point (freezing point of water) is determined at 32°F, the steam point (boiling point) at 212°F
  • The fundamental interval between the two points is 180°F

Measuring correctly

It is best to measure air temperature at a height of around 2 m. In doing so, you should make sure that you do not carry out the measurement in the vicinity of heat or cold sources, because these falsify the result. For measurement outside closed environments, solar radiation is the main factor to take into consideration.

The air temperature measuring instrument with Internet connection

Air temperature measurement with your smartphone

Air temperature sensors

Testo Smart Probes are compact professional measuring instruments for the most important day-to-day measuring tasks. They do not have a display and are operated entirely via the testo Smart App on your smartphone. The testo 915i model (thermometer operated by smartphone) is ideal for recording ambient temperatures.

Other advantages:

  • Rapid detection of temperature change via graphical progression display
  • Measuring range -50 to +400°C
  • Measurement data analyzed and sent via testo Smart App
  • testo 915i testo 915i

    testo 915i - Thermometer with flexible probe and smartphone operation

    Order-Nr. 0563 4915

    • Smart Probe for wireless temperature measurement in a wide range of applications, thanks to a large selection of probes and compatibility with standard type K thermocouple probes
    • Flexible, fast-response temperature sensor (TC type K, class 1) with fibreglass-coated cable (800 mm long) and secure attachment via innovative locking mechanism in the handle, versatile, measuring range -50 to +400 °C

Do you want to measure more than air temperature? You will find just what you need here.

Air measurement

Thermal imagers

With Testo's thermal imagers, you can measure the surface temperature of an object and display this as an infrared image. This method enables the immediate and clear identification of thermal anomalies. That makes the thermal imager the ideal tool for maintenance or the construction industry.

Penetration and immersion thermometers

Penetration thermometers and immersion thermometers are used when neither the temperature of the air nor the temperature on surfaces need to be measured. They are used to measure the temperatures in liquids, pastes, semi-solid or solid media. Their uses include in the food sector (core temperatures), in laboratories or in the pharmaceutical industry.

Data logger with air temperature sensor

Temperature data loggers were specially developed for temperature monitoring. They measure and document temperature values in storage, office or living areas at individually adjustable intervals. For the most part, Testo's models record further measurement parameters as well and guarantee data security even when the battery is empty.

Measurement of surfaces

In addition to air temperature measurement with an appropriate air temperature meter, temperatures on surfaces also have to be measured in a variety of applications. As well as an appropriate surface temperature meter Testo's temperature measuring strips are also suitable for this.