testo 440 - Air flow ComboKit 2 with Bluetooth

Order-Nr.  0563 4407 d

  • Intuitive: Clearly structured measurement menus for volume flow and determination of air velocity, humidity, and temperature in ventilation ducts, or at ventilation outlets

  • Clever: Vane probe (Ø 0.63") with telescope (2.8') – combine the Bluetooth vane probe (Ø 3.9") with the telescope for ceiling outlets, or the funnel set for plate outlets (sold separately)

  • Convenient: Wireless probes, internal memory for data storage, and USB port for data export

  • Versatile: Your testo 440 setup can be expanded with a large selection of digital probes

This testo 440 kit is great for carrying out measurements in ventilation ducts and at air outlets. The testo 440 air velocity and IAQ measuring instrument and its vane probes can all be safely stored in the included case.

Product Description

Use this practical kit to handle all relevant measurements in ventilation ducts and at air outlets. The testo 440 multifunction measuring instrument and its probes are low maintenance, easy to use, and maximize convenience when adjusting air conditioning and ventilation systems.

The testo 440 air flow ComboKit 2 with Bluetooth in detail

testo 440 air velocity and IAQ measuring instrument:
  • No task is too challenging, no application too specific – the testo 440 combines a compact handheld measuring instrument with intuitive measurement menus and a wide selection of air velocity and IAQ probes (probes sold separately)
  • Clearly structured measurement menus – volume flow is calculated precisely, thanks to convenient inputs for the size and geometry of a duct's cross-section. Displays timed and multi-point mean calculation, average volume flow, current reading, and maximum / minimum values
  • Other practical measurement menus, e.g. long-term measurement, volume flow measurement with a funnel, etc.
  • Easy storage and evaluation of measurement data – internal memory for up to 7,500 measurement protocols, which can be read via USB port and further processed as a CSV file on the computer (e.g. with Excel)
  • Practical rear magnets for secure attachment of the measuring instrument to metal surfaces (e.g. ducts)
  • Automatic detection of probes, e.g. vane probes
  • Large, backlit color display
Vane probe (Ø 3.9") with Bluetooth and temperature sensor:
  • Use the vane probe to measure air velocity, volume flow, and air temperature at air/ceiling outlets
  • Measuring range: 59.1 to 6,890 fpm and -4 to +158 °F
  • Versatile – the universal handle can be connected to all probe heads, so you can take care of more applications, and use less equipment
  • The Bluetooth handle makes it more convenient to carry out your measurements and guarantees less cable clutter in your case – it transmits readings to the testo 440, from up to 65 feet away
  • Practical button on the handle – to store individual readings for multi-point mean calculations, or to start and stop measurement series for mean calculations over time
  • Carry out measurements at air/ceiling outlets effortlessly, without using a ladder – fit the vane probe with the extendable telescope and 90° angle (both sold separately)
  • Use the vane probes in conjunction with the testovent measurement funnels and flow straighteners to test incoming / outgoing air at plate outlets, ventilation grills, and swirl outlets
  • Intelligent calibration concept – the testo 440 remains in continuous use, since only the individual probes need calibration
Vane probe (Ø 0.63"):
  • Use the vane probe to measure air velocity and volume flow in ventilation ducts
  • Measuring range from 118.1 to 9843 fpm
  • Integrated telescope with scaling can be extended up to 2.8 feet, making it easy to carry out measurements in ducts
  • Use the fixed cable to connect the vane probe to the testo 440
  • Intelligent calibration concept – the testo 440 remains in continuous use, since only the individual probes need calibration


Delivery Scope

  • testo 440 air velocity and IAQ measuring instrument, 3 AA batteries, USB cable, and calibration protocol (0560 4401)
  • Vane probe (Ø 3.9") with Bluetooth, including temperature sensor (consisting of 3.9" vane probe head, handle adapter, and Bluetooth handle), bracket for testovent measurement funnel, 4 AA batteries, and calibration protocol (0635 9431)
  • Vane probe (Ø 0.63") with fixed cable (length 5.6'), including telescope (extendable to 2.8') and calibration protocol (0635 9532)
  • Combi-case for testo 440 and multiple probes (0516 4401)
Temperature - NTC

Measuring range

-40.0° to 302.0 °F / -40 to +150 °C


±0.7 °F (-40° to -13.2 °F) / ±0.4 °C (-40 to -25.1 °C)

±0.5 °F (-13° to 166.8 °F) / ±0.3 °C (-25 to 74.9 °C)

±0.7 °F (167° to 211.8 °F) / ±0.4 °C (75 to 99.9 °C)

±0.5 % of mv (Remaining Range)


0 °F / 0.1 °C

Temperature - Type K TC

Measuring range

-328.0° to 2498.0 °F / -200 to +1370 °C


±(0.5 °F + 0.3 % of mv) / ±(0.3 °C + 0.3 % of mv)


0 °F / 0.1 °C

General technical data


6.1 x 2.6 x 1.3 in. / 154 x 65 x 32 mm

Operating temperature

-4.0° to 122.0 °F / -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 x AA 1.5 V

Battery life

12 h (typically vane measurement)

Data transfer

Bluetooth®; USB interface

Storage temperature

-4.0° to 122.0 °F / -20 to +50 °C


8.8 oz. / 250 g

Comfort probes

Globe probe Ø 5.9"

Order Number: 0602 0743

Humidity probes

Temperature probes

Immersion tip, flexible

Order Number: 0602 5793

Velocity Probe

Convenience and maximum flexibility for duct and outlet measurements

Use our large range of air velocity probes (please order probes that are not included in the kit separately) to carry out simple, convenient measurements even at locations that are difficult to access in ventilation ducts or at air outlets:

You can even carry out easy measurements in particularly large ducts. This is because the extendable telescope on the hot wire and vane probe (Ø 16 mm) with universal handle can be further extended using the telescope extension – enabling you to attain a total length of 2 metres.

Carry out measurements at air/ceiling outlets effortlessly and without using a ladder. Fit your vane probe (Ø 100 mm) with the telescope with 90° angle and, if necessary, with the telescope extension (both can be ordered separately).

Greater freedom thanks to Bluetooth: the air velocity probes with Bluetooth have no inconvenient cable connection to the measuring instrument, and they transmit readings up to a distance of 20 m. Press the button on the probe to operate the measuring instrument – for example, to start and stop a series of measurements (timed mean calculation).

Attach the testo 440 dP air velocity and IAQ measuring instrument to metal surfaces (e.g. ducts) easily using the practical magnets.

Benefit from fast calculation of the volume flow: in the “volume flow” measurement menu of the multifunction measuring instrument, configure the dimensions and geometry of the duct cross-section – the measuring instrument shows you the volume flow straight away.

Long-term monitoring of indoor air quality

Poor indoor air quality due to excessive concentrations of CO2 can cause tiredness, lack of concentration and even illness. With its menu for recording readings, the testo 440 air velocity and IAQ measuring instrument is ideal for monitoring the indoor air quality. Enter the measurement time and the measuring cycle – and, for example, track the change in CO2 concentration or humidity and temperature values over the course of the day. Simply choose between probes with Bluetooth or fixed cable for CO2, CO or humidity (please order probes separately).

Turbulence measurement in accordance with EN ISO 7730 / ASHRAE 55

Determine the degree of turbulence and the draught risk in the workplace: draught restricts the comfort level and is the most common cause of complaints about the indoor climate. The turbulence probe (please order separately) measures air velocity and air temperature, and automatically calculates the draught risk and the degree of turbulence in accordance with EN ISO 7730/ASHRAE 55.
For convenient measurements at varying heights, we recommend using our measuring tripod for comfort level measurement (please order separately). This makes it very easy to position turbulence probes in compliance with the standards.

Range of probes for cleanrooms and laboratories

The testo 440 air velocity and IAQ measuring instrument is also ideal for a wide variety of applications in cleanrooms and laboratories in conjunction with the following probes (please order separately):
  • High-precision air velocity measurement on fume cupboards with the fume cupboard probe
  • Thanks to the low start-up speed of 0.1 m/s, the high-precision vane probe (Ø 100 mm) is ideal for laminar flow measurements in cleanrooms. It is available as a variant with Bluetooth or with fixed cable
  • To measure the humidity in cleanrooms, we recommend the high-precision humidity/temperature probe (0636 9771 or 0636 9772). With an accuracy of: ±(0.6% RH + 0.7 % of m.v.) (0 to 90% RH), it also meets the requirements for humidity measurements in this particularly sensitive area