Testo 440 dP Air Velocity and IAQ Meter with Differential Pressure Sensor
What is the Testo 440 dP Air Velocity and IAQ Meter with Differential Pressure Sensor?
The Testo 440 dP is a multifunction air velocity and IAQ meter designed for UK HVAC engineers and building-services technicians who need accurate airflow, differential pressure and indoor air quality measurements on site. With a built-in differential pressure sensor, the instrument supports Pitot tube readings, duct diagnostics, filter checks and K-factor volume flow calculations without needing additional pressure meters. Its intuitive menu structure makes tasks like turbulence checks, comfort assessments or long-term monitoring quick and standard-compliant, helping technicians work more efficiently across ventilation, commissioning and air balancing jobs.
Why HVAC engineers choose the Testo 440 dP
Supporting Bluetooth, cabled and thermocouple probes simultaneously, the 440 dP streamlines testing without cable clutter and provides flexibility for measuring air velocity, temperature, humidity, CO₂ or pressure using the wide Testo probe range. The instrument stores up to 7500 measurement reports with simple USB export in CSV format for compliance or commissioning documentation. Compact, accurate and easy to navigate, the 440 dP is a practical choice for duct surveys, airflow balancing, cleanroom checks or IAQ investigations in demanding environments.
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Temperature (NTC): -40 to +150 °C ±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) resolution 0.1 °C
Temperature (Type K): -200 to +1370 °C ±(0.3 °C + 0.3% of mv) resolution 0.1 °C
Differential pressure: -150 to +150 hPa ±0.05 hPa (0 to 1.00 hPa) ±0.2 hPa +1.5% of mv (1.01 to 150 hPa) resolution 0.01 hPa
Probe connections: 1 × digital cable probe or NTC, 1 × Bluetooth probe or Smart Probe, 1 × dP internal, 1 × Type K
Operating temperature: -20 to +50 °C
Storage temperature: -20 to +50 °C
Battery type: 3 × AA
Battery life: approx. 12 h (typical vane measurement)
Testo 440 dP instrument with differential pressure sensor
3 × AA batteries
USB cable
Connection hose (for dP)
Calibration protocol
Why choose Instrotech for your electrical test equipment?
With over 40 years’ experience supporting UK electricians, technicians and engineers, Instrotech is your trusted partner for quality tools and expert service. When you purchase from us, you benefit from:
Free UK shipping on all orders
Access to our knowledgeable technical support team
Available calibration services to maintain safety compliance
A 90-day money-back guarantee for complete peace of mind
We’re committed to helping you work safely and efficiently with industry-leading products and ongoing support.
