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The testo 440 combines the benefits of a compact handheld device with intuitive measurement menus and a comprehensive selection of air velocity & IAQ probes. This
means you have all measuring tasks on air conditioning and ventilation systems reliably under control.
Use the testo 440 dP air velocity and IAQ measuring instrument in combination with the high-quality, digital probes to measure and store all air velocity and IAQ parameters (please order probes separately). Up to 3 probes can be connected simultaneously: a Bluetooth probe, a wired probe and a temperature probe with type K thermocouple connector. Automatic probe detection and clearly structured measurement menus guarantee simple operation and will make your day-to-day work easier.
A differential pressure sensor is already integrated in the testo 440 dP. This makes it possible to carry out measurements on filters and fans, as well as Pitot tube and K-factor measurements (please order Pitot tube separately).
Measure in just a few clicks with the testo 440 dP multifunction measuring instrument
Carry out your measurements quickly and easily: the air velocity and IAQ measuring instrument automatically detects each connected probe. This means that there is no need for you to manually reset the parameters when changing probes. Clearly structured measurement menus for measuring the volume flow in ducts/at outlets, funnel measurement, determining the volume flow via differential pressure and K-factor, measuring the degree of turbulence, determining the cooling/heating output, mould detection and long-term measurement provide you with optimum support during your day-to-day work.
Wireless and space-saving: more applications, less equipment
Endlessly versatile: a universal handle can be connected to all probe heads – so you can master more applications using less equipment and save space.
The Bluetooth handle makes it more convenient to carry out your measurement and guarantees less cable clutter in the case. It makes it possible to carry out measurements without any bothersome cable connection and it transfers readings up to a distance of 20 m. Or as a practical alternative, use the cable handle to connect testo probe heads. This is an advantage if Bluetooth signals are not permitted.
Practical measurement data management
The multifunction measuring instrument stores up to a max. 7500 measurement protocols, which can be read via a USB port and further processed as a CSV file on your computer (e.g. with Excel). With the testo BLUETOOTH/IRDA printer (please order separately), you have the option of producing a report printout of the measurement data directly on site.
Intelligent calibration concept for maximum precision
You can rely on accurate measurement results when using our digital probes, because the measuring instrument makes measurement uncertainty a thing of the past. You only need to send the probes in for calibration. The multifunction measuring instrument can therefore remain in continuous use.
Advantages of measuring with the testo 440 dP air velocity and IAQ measuring instrument
Precise and reliable in ducts and at air outlets
Long-term monitoring of indoor air quality
Turbulence measurement in accordance with EN ISO 7730 / ASHRAE 55
Range of probes for cleanrooms and laboratories
|Temperature - NTC||Temperature - TC Type K (NiCr-Ni)||Differential pressure (internal sensor) - Piezoresistive|
|Measuring range||-40 to +150 °C||-200 to +1370 °C||-150 to +150 hPa|
|Accuracy||±0.4 °C (-40 to -25.1 °C)
±0.3 °C (-25 to +74.9 °C)
±0.4 °C (+75 to +99.9 °C)
±0.5 % of mv (Remaining Range)
|±(0.3 °C + 0.3 % of mv)||±0.05 hPa (0 to 1.00 hPa)
±0.2 hPa + 1.5 % of mv
(1.01 to +150 hPa)
|Resolution||0.1 °C||0.1 °C||0.01 hPa|
|General technical data|
|Operating temperature||-20 to +50 °C|
|Storage temperature||-20 to +50 °C|
|Connectable probes||1 x digital probe with cable or 1 x Temperature NTC TUC, 1 x digital Bluetooth probe or testo Smart Probe, 1 x differential pressure (internal), 1 x Temperature TC Type K|
|Battery type||3 AA mignon 1.5 V|
|Battery life||12 h (typically vane measurement)|
|Storage temperature||-20 to +50 °C|
|Dimensions||154 x 65 x 32 mm|
Buy with 100% confidence knowing your purchase is backed by the full Manufacturer's Warranty. Please register your product with provided warranty card.
Australia-wide Flat Rate shipping of $15.00 per order.
This includes multiple products up to 5kg only.
Additional cost applies for orders over 5kg. Contact us for quotation.