This multifunction instrument allows you to carry out a variety of measurements with just a few clicks. There is no need to manually adjust settings when switching probes, as each one is automatically identified. The instrument includes preconfigured menus for common applications such as volume flow measurement in ducts and at outlets, funnel measurements, assessing heating or cooling output, mould detection, turbulence levels, and long-term monitoring, helping streamline your workflow.
The testo 440 system is designed to be both space-efficient and adaptable. A universal handle can be used with multiple probe heads, reducing the amount of equipment required. For added convenience, a Bluetooth handle allows for wireless measurements up to 20 metres away, eliminating the need for trailing cables. Where wireless transmission is restricted, a cable handle provides a practical alternative.
Managing measurement data is straightforward. The instrument includes internal storage for up to 7,500 measurement protocols, which can be exported via USB as CSV files for analysis on a computer. For immediate documentation, an optional Bluetooth/IRDA printer allows you to print reports directly on site.
To ensure consistently accurate readings with minimal downtime, only the digital probes require calibration—the main instrument remains in continuous use. This intelligent calibration approach reduces disruption while maintaining measurement precision.
The testo 440 excels in a wide range of applications. For duct and outlet measurements, compatible probes include hot wire and 16 mm vane types, while 100 mm vane probes are ideal for assessing air outlets. The instrument enables quick calculation of volume flow by entering the duct dimensions. Measurements in large or hard-to-reach ducts are made easier using an extendable telescope that can reach up to 2 metres. A 100 mm vane probe paired with a 90° angled telescope attachment enables ceiling outlet measurements without the need for ladders. When used with testovent measurement funnels and flow straighteners, the system provides efficient testing of airflows at grilles, plate outlets, and swirl diffusers. Bluetooth-enabled probes enhance convenience by allowing control of measurement functions directly from the probe handle. The instrument also features built-in magnets for secure attachment to metal surfaces such as ventilation ducts.
- For indoor air quality monitoring, the system supports probes for CO₂, CO, temperature, and humidity, available in both Bluetooth and wired versions. Simply configure the measurement duration and interval to track air quality over time. The instrument’s memory capacity makes it suitable for long-term environmental monitoring in workplaces, educational institutions, and public buildings.
- For comfort assessments, the turbulence probe delivers accurate readings even at low air velocities. It automatically calculates draught risk and turbulence levels in accordance with EN ISO 7730 and ASHRAE 55. To ensure consistent and standard-compliant positioning during comfort level measurements at different heights, a tripod is available to support the turbulence probes.
- In laboratory and cleanroom environments, the testo 440 provides a range of precision probes tailored to sensitive applications. The fume cupboard probe enables accurate measurement of airflow in safety cabinets, while the high-precision 100 mm vane probe, with a start-up speed as low as 0.1 m/s, is ideal for assessing laminar airflow conditions. For humidity monitoring in controlled environments, the temperature/humidity probes (models 0636 9771 and 0636 9772) offer excellent accuracy of ±(0.6% RH + 0.7% of the measured value) within the 0–90% RH range.
