testo 440 CO₂ Kit with Bluetooth®

Order-Nr.  0563 4405

  • Intuitive: clearly structured measurement menu for long-term measurement and parallel determination of CO₂ concentration, humidity and air temperature in indoor areas

  • Precise: absolute pressure compensation, calculation of wet bulb temperature, dew point and absolute humidity

  • Convenient: wireless probe, internal data storage and USB port for data export

  • As multifaceted as your challenges themselves: the air velocity and IAQ measuring instrument can be expanded with a large portfolio of digital probes

Kit for evaluating the indoor air quality. The testo 440 air velocity and IAQ measuring instrument and the CO2 probe with Bluetooth including temperature and humidity sensor are all safely stowed away in the case. So you can get down to work straight away!

kn 5 382,00
kn 6 727,50 incl. VAT

Product Description

Use this practical kit to measure CO2 concentration, humidity and air temperature and to evaluate the indoor air quality in offices, production areas or storage facilities. The multifunction measuring instrument and the CO2 probe feature an intelligent calibration concept, ease of use and maximum convenience for your measuring tasks.


testo 440 CO2 Kit with Bluetooth in detail

testo 440 air velocity and IAQ measuring instrument:
  • No task is too challenging, no application too specialized: the testo 440 combines a compact hand-held measuring instrument with intuitive measurement menus and a wide selection of air velocity and IAQ probes
  • Clearly structured measurement menu for long-term measurement: for long-term monitoring, enter the measurement time and measuring cycle in the measuring instrument and record measurement data trends
  • 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
  • Automatic detection of probes, e.g. CO2 probe
  • Large, backlit colour display
CO2 probe with Bluetooth, including temperature and humidity sensor:
  • Measure CO2 concentration, humidity and air temperature and calculate dew point, wet bulb temperature and absolute humidity
  • Accurate measurement results thanks to air density compensation via the integrated absolute pressure measurement
  • Measuring range: 0 to 10,000 ppm, -10 to +50 °C, 5 to 95% RH
  • 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
  • Endlessly versatile: a universal handle can be connected to all probe heads – so you can take care of more applications using less equipment, and save space too
  • Intelligent calibration concept: the measuring instrument remains in continuous use, since only the probe head is sent in for calibration


Delivery Scope

  • testo 440 air velocity and IAQ measuring instrument, 3 x AA batteries, USB cable and calibration protocol (0560 4401)
  • CO2 probe* with Bluetooth, including temperature and humidity sensor (consisting of CO2 probe head and Bluetooth handle); 4 x AA batteries, table stand and calibration protocol (0632 1551)
  • Basic case for testo 440 and 1 probe

*Please do not use the probe in condensing atmospheres. For continuous application in high-humidity ranges
> 80% RH at ≤ 30 °C for > 12 h
> 60% RH at > 30 °C for > 12 h
please contact Testo Service or contact us via the Testo website.
Temperature - NTC

Measuring range

-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)


0,1 °C

Temperature - TC Type K (NiCr-Ni)

Measuring range

-200 to +1370 °C


±(0,3 °C + 0,3 °C)


0,1 °C

General technical data


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

USB interface

Storage temperature

-20 to +50 °C


250 g

Comfort probes

Humidity probes

kn 577,50
kn 721,88 incl. VAT

Pressure probes

kn 462,00
kn 577,50 incl. VAT

Temperature probes

kn 385,00
kn 481,25 incl. VAT
kn 500,50
kn 625,62 incl. VAT
kn 577,50
kn 721,88 incl. VAT
kn 1 085,70
kn 1 357,12 incl. VAT
Magnetic probe (TC Type K)

Order Number: 0602 4892

kn 1 201,20
kn 1 501,50 incl. VAT
kn 300,30
kn 375,38 incl. VAT
kn 900,90
kn 1 126,12 incl. VAT
Immersion tip, flexible, TC Type K

Order Number: 0602 5792

kn 192,50
kn 240,62 incl. VAT
kn 900,90
kn 1 126,12 incl. VAT
kn 115,50
kn 144,38 incl. VAT


kn 693,00
kn 866,25 incl. VAT
kn 577,50
kn 721,88 incl. VAT

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 that are not included in the kit 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.

Convenience and maximum flexibility for duct and outlet measurements

With our large range of air velocity probes (please order separately), you can carry out simple and convenient measurements even at locations that are difficult to access in ventilation ducts or at air outlets:
you will even find it easy to carry out 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 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.

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