Testo delta P Air Flow ComboKit 1 with Bluetooth



  • Intuitive: clearly structured measurement menu for volume flow and parallel determination of air velocity, differential pressure, humidity and temperature in ventilation ducts or at ventilation outlets
  • Space-saving: simply combine the universal Bluetooth handle with the 100 mm vane or hot wire probe head and the extendable telescope (1.0 m)
  • Convenient: wireless probes, internal data storage and USB port for data export
  • As multifaceted as your challenges themselves: the testo 440 dP has an integrated differential pressure sensor and can be expanded with a large portfolio of digital probes

More Information
Warranty 2 years
Price Match No

Product Description

Carry out measurements without any annoying cables thanks to the universal Bluetooth handle: use this practical kit to handle all relevant measurements in ventilation ducts and at air/ceiling outlets. The testo 440 dP multifunction measuring instrument, the vane probe and the hot wire probe head all feature ease of use, maximum convenience for the adjustment of air-conditioning and ventilation systems and an intelligent calibration concept.

Testo 440 delta P Air Flow ComboKit 1 with Bluetooth in detail
Testo 440 dP air velocity and IAQ measuring instrument including differential pressure sensor:

  • With an integrated differential pressure sensor, e.g. for checking filters, for Pitot tube measurement (Pitot tubes can be ordered separately) or K factor measurement
  • No task is too challenging, no application too specialized: the testo 440 dP combines a compact hand-held measuring instrument with intuitive measurement menus and a wide selection of air velocity and IAQ probes (please order separately)
  • Clearly structured measurement menus for carrying out measurements in ventilation ducts and at duct/ceiling outlets: the volume flow is precisely calculated thanks to convenient input of the size and geometry of the duct cross-section. Timed and multi-point mean calculation, average volume flow, current reading and min./max. values are displayed
  • Other practical measurement menus, e.g. determination of volume flow via differential pressure and K factor, long-term measurement, volume flow measurement with a funnel, etc.
  • Easy storage and evaluation of measurement data. Measurement data memory for up to 7500 measurement protocols, which can be read via a USB port and further processed as a CSV file on the computer (e.g. with Excel)
  • Practical magnets for easy attachment of the measuring instrument to metal surfaces (e.g. ducts)
  • Automatic detection of probes, e.g. vane probe, hot wire probe
  • Large, backlit colour display

Vane probe (Ø 100 mm) with Bluetooth including temperature sensor:

  • Use the vane probe (Ø 100 mm) to conveniently determine air velocity, volume flow and air temperature at air/ceiling outlets
  • Measuring range: +0.3 to +35 m/s, -20 to +70 °C
  • More applications – less equipment: the universal handle on your 100 mm vane probe is easy to attach to other probe heads or telescopes. This allows you to expand your portfolio of probes and save space in the measuring case
  • Carry out measurements at air/ceiling outlets effortlessly and without using a ladder: simply connect the vane probe to the extendable telescope with 90° angle included in the kit.
  • Wireless: the Bluetooth handle makes it more convenient to carry out your measurements and guarantees less cable clutter in the case
  • Practical button on the handle: to store individual readings for multi-point mean calculation or to start and stop measurement series for mean calculation over time
  • Our recommendation for carrying out accurate measurements at plate outlets/ventilation grilles: use the vane probe with the testovent 417 funnel set (available to order separately). If you add in the volume flow straightener (please order separately), you can achieve an impressively high level of precision when carrying out measurements at swirl outlets with turbulent air flow
  • Intelligent calibration concept: the air velocity and IAQ measuring instrument remains in continuous use, since only the probe head is sent in for calibration

Hot wire probe head including temperature and humidity sensor:

  • Use the hot wire probe to measure air velocity, volume flow, air temperature and humidity in ventilation ducts
  • Accurate measurements from 0 to +50 m/s thanks to the robust sensor and automatic absolute pressure compensation. Air temperature and humidity measuring range: -20 to +70 °C, 5 to 95% RH
  • Convenient measurements in ventilation ducts: the probe head is easy to attach to the robust, non-rotatable telescope (up to 1.0 m) supplied, with easy-to-read scaling and Bluetooth handle
  • Practical button on the handle: to store individual readings for multi-point mean calculation
  • Our recommendation for carrying out measurements in larger ducts: use the telescope extension (available to order separately) – enabling you to attain a total length of 2 metres
  • Intelligent calibration concept: only the hot wire probe head needs to be sent in for calibration

Delivery Scope

  • testo 440 dP air velocity and IAQ measuring instrument including differential pressure sensor, connection hose, 3 x AA batteries, USB cable and calibration protocol (0560 4402)
  • Vane probe (Ø 100 mm) with Bluetooth including temperature sensor (consisting of 100 mm vane probe head, handle adapter and Bluetooth handle); bracket for testovent measurement funnel; 4 x AA batteries and calibration protocol (0635 9431)
  • Hot wire probe head (Ø 9 mm) including temperature and humidity sensor and calibration protocol (0635 1570)
  • Extendable telescope (up to 1 m in length) for air velocity probes with a universal handle including 90° angle (0554 0960)
  • Combi-case for testo 440 and multiple probes (0516 4401)
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 (internal sensor) - Piezoresistive
Measuring range -150 to +150 hPa

±0.05 hPa (0 to 1.00 hPa)
±0.2 hPa + 1.5 % of mv
(1.01 to +150 hPa)


0.01 hPa

General technical data
Dimensions 154 x 65 x 32 mm
Operating 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 Temperature TC Type K
Battery type 3 AA mignon 1.5 V
Battery life 12 h (typically vane measurement)
Data transfer Bluetooth®; USB interface
Storage temperature -20 to +50 °C
Weight 250 g

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