Diff. Pressure Measuring Instrument – Testo 440-dP

Model No: Testo 440-dPPart No: 0560 4402

The multifunction measuring instrument testo 440 in combination with high-quality probes help in precise, reliable measurement of all air velocity and IAQ parameters for adjusting air conditioning and ventilation systems, monitoring air quality or carrying out comfort level measurements

  1. Intuitive: clearly structured measurement menus for the most important applications stored on the instrument
  2. Wireless: Bluetooth probes for greater measuring convenience and a reduced tangle of cables in the case
  3. Space-saving: a universal handle for all probes
  4. Clear overview: parallel display of 3 measuring values; configuration and results at a glance
  5. Reliable: internal memory for up to 7500 measurement protocols, USB interface for data export and optional printout of measuring values


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.

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.

Technical Data

Temperature – NTC
Measuring range -40 to +150 °C
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)
Resolution 0.1 °C
Temperature – TC Type K (NiCr-Ni)
Measuring range -200 to +1370 °C
Accuracy ±(0.3 °C + 0.3 % of mv)
Resolution 0.1 °C
Differential pressure
Measuring range -150 to +150 hPa
Accuracy (±1 digit) ±0.05 hPa, (0 to +1.00 hPa), ±0.2 hPa + 1.5% of m.v., (+1.01 … +150 hPa)
Resolution 0.01 hPa
General technical data
Weight 250 g
Dimensions 154 x 65 x 32 mm
Operating temperature -20 to +50 °C
Product colour black/orange
Battery type 3 AA mignon 1.5 V
Battery life 12 h (typically vane measurement)
Interface Bluetooth®; USB
Storage temperature -20 to +50 °C



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