Testo 440 Air Velocity and IAQ Measuring Instrument


440 Features and Applications


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Versatility in a Compact Design

The testo 440 combines a compact handheld measuring instrument with intuitive measurement menus and a comprehensive selection of air velocity and IAQ probes. This means that you have all measuring tasks on air conditioning and ventilation systems reliably under control.

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Intuitive - Clearly Structured Menus and a Large Display

Measurement menus essential air conditioning and ventilation applications, such as volume flow, K factor, and degree of turbulence in accordance with EN ISO 7730 / ASHRAE 55, heating/cooling output, mold detection, and long-term measurement are programmed into the testo 440. These menus enable you to accomplish the relevant measuring task more quickly, more efficiently and automatically guarantee reliable measurement results. Measurements can easily be configured via the large display; readings and results are available at a glance.

Testo 440 in fieldTesto 440 in field

Wireless - Available Bluetooth Probes Eliminate Cable Clutter

The Bluetooth probes for the testo 440 are available for all applications. They transfer readings to the measuring instrument wirelessly. This guarantees greater efficiency and less cable clutter in your instrument's case.

And when you need to carry out measurements in places where Bluetooth is unavailable, simply switch the probe head over from Bluetooth to the cable handle.

Testo 440 in fieldTesto 440 in field

Space Saver - One Handle for All Probes, Wired or Wireless

Both the Bluetooth and the cable handle available for the testo 440 can be universally combined with all the attachments in the testo 440 probe system. This saves space and reduces the weight, enabling you to perform accurate measurements in any application. This also means that you will need less equipment, and it will take you a matter of seconds to switch from measuring comfort level to determining volume flow in ducts.

Testo 440 in fieldTesto 440 in field

Money Saver - A One-Time Investment with Long-Term Benefits

The testo 440 air velocity and IAQ measuring instrument is an investment in smart, robust technology, which will certainly pay off. It is suitable for all air conditioning applications - you will not need another measuring instrument. Its probes can be flexibly extended, which lowers costs for both accessories and probes. Finally, the testo 440 and testo 440 dP do not need to be calibrated, only the probes do. Handles and measuring instrument still work and can continue to be used for measurements with a different probe.

440 Applications


Measurement MenuMeasurement Menu

Measurement Menu

  • Volume flow: Automatic calculation of volume flow in ducts and at outlets simply by inputting duct parameters and measuring flow velocity
  • Funnel measurement: Simplified volume flow measurement at air outlets with measurement funnel
  • Pitot tube measurement: Calculation of volume flow using measurement of differential pressure and Pitot tube factor; recommended in case of high flow velocities or heavily contaminated flow
  • K-factor, volume flow measurement: Calculation of volume flow using K-factor and differential pressure measurement
  • Heating/cooling load: Determination of enthalpy of ventilation system via parallel measurement of humidity and temperature of incoming/outgoing air
  • Mould indication: Comparison of surface temperature with dew point and indication of risk of mould according to traffic light system (red = extremely high risk of mould; yellow = risk of mould; green = no risk of mould)
  • Turbulence measurement: Assessment of the comfort level based on determination of turbulence and draught rate as per EN ISO 7730/ASHREA 55; draught rate indicates how many people are dissatisfied with draught/air movement in room
  • Long-term measurement: Simply input measurement period and measuring interval, and measuring value curves for required parameters are recorded
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Air Velocity Measurement in Ducts

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Testo 440 in fieldTesto 440 in field

Air Velocity Measurement at Outlets

For good indoor air quality, the incoming/outgoing air volume flows must be optimally adjusted. The 100 mm vane kit for the testo 440 now makes this task even simpler. With the optional funnel set or telescope, you can perform measurements at outgoing air or ceiling outlets conveniently and safely. Our flow straightener helps you perform accurate measurement of turbulent flows.

Measuring Comfort Level/Indoor Air Quality

Measuring the air quality and comfort level of indoor spaces makes it possible to maintain the optimal year-round environment for all of a building's occupants. These versatile testo 440 kits measure all the relevant parameters – CO2 concentration in the air, degree of turbulence, temperature, humidity, and illuminance.

Testo 440 in fieldTesto 440 in field
Testo 440 in fieldTesto 440 in field

Measurements in Laboratories and Cleanrooms

For measurement applications in laboratories and other controlled environments, suitable testo 440 probes enable critical process control measurements, for which maximum precision and resilient equipment are essential. The testo 440 and its probes are ideal for industrial environments where temperatures are high, as well as laboratories, where it is essential to record even the smallest values with a high level of accuracy.

440 Probes


Air Quality Probes



Light Probes



Velocity Probes

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