Air Velocity & Flow

Kit for carrying out measurements in ventilation ducts: the testo 440 air velocity and IAQ measuring instrument and the vane probe (Ø 16 mm) are safely stowed away in the case. So you can get down to work straight away!

Use the testo 440 air velocity and IAQ measuring instrument in combination with high-quality 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.

Use the fixed cable to connect the vane probe to the measuring instrument. The probe is equipped with a telescope, which can be extended to a maximum length of 0.85 m. The immersion depth is easy to read off thanks to the scaling on the telescope.

The clearly structured measurement menu for volume flow makes the measuring instrument intuitive to operate. 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 in the measuring instrument.

Intelligent calibration concept

You will get exceptionally accurate measurement results with the digital probe, because the measuring instrument makes measurement uncertainty a thing of the past. You only need to send the probe in for calibration – so the measuring instrument remains in continuous use.

Areas of application for the vane probe

Ventilation ducts: Use the vane probe to measure air velocity in ventilation ducts with reliability. Benefit from fast calculation of the volume flow: in the “volume flow” measurement menu of the compatible measuring instrument (please order separately), configure the dimensions and geometry of the duct cross-section – the measuring instrument shows you the volume flow straight away.

Kit for carrying out measurements at air outlets: the testo 440 air velocity and IAQ measuring instrument and the vane probe (Ø 100 mm) with Bluetooth® including temperature sensor are all safely stowed away in the case. So you can get down to work straight away!

Use the testo 440 air velocity and IAQ measuring instrument in combination with high-quality 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.

Use the vane probe with the compatible testo multifunction measuring instrument (please order separately) to measure air velocity, volume flow and temperatures up to +70 °C.

Vane probe with Bluetooth including temperature sensor – features

The readings of the vane probe are transmitted to your measuring instrument via Bluetooth, up to a distance of 20 m.

The clearly structured measurement menu for volume flow enables the measuring instrument to be operated intuitively. 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 in the measuring instrument.

Particularly useful: press the button on the vane probe to operate the measuring instrument. For example, to store individual readings for multi-point mean calculation or to start and stop measurement series for mean calculation over time.

Wireless and space-saving: more applications, less equipment

Endlessly versatile: a universal handle can be connected to all probe heads – so you can master more applications using less equipment and save space. The Bluetooth handle makes it more convenient to carry out your measurement and guarantees less cable clutter in the case.

Or order the cable handle to connect testo probe heads. This is an advantage if Bluetooth signals are not permitted. If the vane needs to be replaced in the distant future, you can change the probe head.

If required, you can also fit the vane probe with the extendable telescope with 90° angle and, if necessary, the telescope extension (both can be ordered separately; in combination 2 m long). This makes it easy to measure at ceiling outlets.

Intelligent calibration concept

You will get exceptionally accurate measurement results with the digital vane probe, because the measuring instrument makes measurement uncertainty a thing of the past. You only need to send the probe head in for calibration – so the measuring instrument remains in continuous use.

Areas of application for the vane probe with Bluetooth

Air/ceiling outlets: Use the vane probe to determine air velocity and volume flow at air outlets. During loop-pattern scanning of the grille’s cross section, the air velocity values are integrated and averaged across a large area of 100 mm. As a result, precise measurement results are achieved with the loop measurement.

For measurements at ceiling outlets: the extendable telescope (1.0 m long) with easy-to-read scaling and 90° angle is easy to attach to the vane probe. The 90° angle ensures that the probe is positioned correctly under the ceiling. For high ceilings, you can also use the telescope extension, attaining a total length of 2 metres (please order the extendable telescope and telescope extension separately).

Plate outlets, ventilation grilles and swirl outlets: For convenient, accurate measurements at plate outlets and ventilation grilles, we recommend using the vane probe with the testovent 417 funnel set (please order separately). This guarantees simple testing of incoming/outgoing air – such as in the controlled ventilation of living spaces.

If you add in the volume flow straightener (please order separately), an impressively high level of precision can be achieved when carrying out measurements at swirl outlets.

Kit for carrying out measurements in ventilation ducts: the testo 440 air velocity and IAQ measuring instrument and the hot wire probe (Ø 9 mm) including temperature sensor are all safely stowed away in the case. So you can get down to work straight away!

Use the testo 440 air velocity and IAQ measuring instrument in combination with high-quality 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.

Hot wire probe – features

Use the fixed cable to connect the hot wire probe to the measuring instrument.

The probe is equipped with a telescope, which can be extended to a maximum length of 0.85 m. To ensure accurate measurement results, air density compensation is carried out via the integrated absolute pressure measurement.

The clearly structured measurement menu for volume flow makes the measuring instrument intuitive to operate. 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 in the measuring instrument.

Integrated sensor protection: when you are not using the hot wire probe, the rotatable protective cap protects the air velocity sensor from dirt and mechanical stress.

Intelligent calibration concept

You will get exceptionally accurate measurement results with the digital probe, because the measuring instrument makes measurement uncertainty a thing of the past. You only need to send the probe in for calibration – so the measuring instrument remains in continuous use.

Areas of application for the hot wire probe

Ventilation ducts: Use the hot wire probe to measure air velocity and air temperature in ventilation ducts with reliability. Benefit from fast calculation of the volume flow: in the “volume flow” measurement menu of the compatible measuring instrument (please order separately), configure the dimensions and geometry of the duct cross-section – the measuring instrument shows you the volume flow straight away.

The testo 420 air capture hood for larger air inlets and outlets enables fast and precise compliance with hygiene guidelines and requirements concerning room air quality. It provides reliable support with the calculation of the overall air capture on HVAC systems, for instance in hospitals, office buildings or commercial buildings.
High measuring accuracy at swirl outlets thanks to air capture straightener
Air capture is frequently measured at swirl outlets. Air flows are often incorrectly measured due to the turbulent air at these outlets.

The testo 420 air capture hood means you can significantly reduce these measurement errors. The integrated air capture straightener calms the turbulence and converts it into a virtually uniform air flow. This enables accurate calculation of air capture in the 80 to 3,500 m3/h range.
Exceptionally light air capture hood with fast set-up
The air capture hood with ergonomic handles and tiltable display has an exceptional weight of less than 2.9 kg. This means that frequent air capture calculations in large rooms and measurements above head height can also be carried out reliably and comfortably. In the process, a large measuring button on the air capture hood ensures easy recording of the readings.

The dimensions of the hood are 610 x 610 mm. We offer additional hoods as accessories for further ceiling outlets. The use of our optional tripod arm is a great help for air inlets and outlets which are located very high up. It can be extended up to 4 metres.

The air capture hood is quick and easy to set up thanks to tension rods. The trolley which is included in the scope of delivery ensures safe transport.
Create protocols directly on site and mail them using the App connection
Take advantage of further practical functions and download our free App. Because the App connection enables mobile devices such as smartphones and tablets to be used as a secondary display and remote control via Bluetooth. This is particularly practical for using a tripod arm for high ceilings.

The App enables live measurement on HVAC systems using a start and stop function and the saving of measurement data in txt format. You can create the measurement protocol directly on site using the App. Measurement results, such as the overall air capture and the air exchange rate, can be directly assigned to customer-specific protocol templates. You can then send your readings and protocols via the e-mail function. This means you save a considerable amount of time and increase efficiency.
Air capture hood with removable measuring instrument - performance overview
The air capture hood for HVAC systems is equipped with a measuring instrument for displaying measurement data. The device can be tilted and removed for user-friendly reading of measuring values.

The testo 420 measuring instrument enables you to measure flow velocity, air capture, absolute pressure, temperature and relative humidity. The automatic zeroing ensures higher accuracy for low pressures.

All measuring values are easy to read on the large display which has an illumination function. For analyses and documentation, measurement data can be saved and measurement protocols created directly on site using the App connection. Administration of the measurement data is very easy on the PC without any additional software via the plug & play function.

The testo 420 air capture hood with its integrated measuring instrument was not just developed for air capture measurement at larger ceiling outlets. The measuring instrument can also be taken off the hood and used for pressure, flow and air capture measurements in the duct. This means you can save on the purchase of an additional measuring instrument.

You merely have to attach a Pitot tube and connection hoses (both optional) for measurements in ducts. Timed and multi-point mean calculation, as well as the combination of the two, together with simple input of the duct geometry provide you with support for measurements in ducts.

The testo 416 air flow meter provides you with quick and reliable air flow readings on an easy-to-read, backlit display.

The permanently connected telescopic sensor, which can be extended to a maximum length of 890 mm and a mini vane that has a diameter of 16 mm make the air flow meter ideal for measuring the air flow and air volume in air ducts.

In order to calculate the air volume, simply enter the duct cross section area into the air flow meter. The timed and point mean value calculations will then show the average air volume. The testo 416 air flow meter also has a hold function which allows you to freeze the last reading as well as min/max readings which can be displayed at the touch of a key.

More accessories for even more benefits in the field

Additional optional accessories include a practical all-in-one shoulder bag or carrying case and a TopSafe protective case that protects the air flow meter against impact, dirt and water.

What’s included
testo 416 air flow meter with permanently connected 16 mm telescopic vane (max. length 890 mm), calibration certificate, batteries.

The testo 417 vane anemometer allows you to measure air flow speed, volumetric flow rate and temperature simultaneously. The integrated vane of the anemometer makes it ideal for carrying out measurements at air inlets and outlets.
The optionally available testovent 417 funnel set allows you to carry out measurements at ventilation grilles and disk valves. There is also an air flow rate rectifier for carrying out quick and reliable measurements at diffusers.

The vane anemometer is designed to provide you with the following values
The easy-to-read display shows all important data including air flow direction –ie. whether the air is being sucked in or blown out, air flow speed and the volumetric flow rate as well as the actual temperature.
The mean time value and average value provide you with information regarding the average volumetric flow rate, air flow speed and the temperature measurement. In order to carry out the volumetric flow rate simply enter the area of the duct or use the optionally available funnel set.
In addition, there is also a hold function which allows you to compare the measurement you have just take with previous measurements. Min and max values are also available at the touch of a key. And thanks to the testo 417 vane anemometer’s backlit display you can read the measurements in the dark or in poor lighting.

Kit for carrying out measurements in ventilation ducts and at air outlets: The testo 440 air velocity and IAQ measuring instrument, the vane probe (Ø 100 mm) with Bluetooth® including temperature sensor and the hot wire probe including temperature sensor are all safely stowed away in the case. So you can get down to work straight away!

Use the testo 440 air velocity and IAQ measuring instrument in combination with high-quality 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.

Vane probe with Bluetooth including temperature sensor – features

The readings of the vane probe are transmitted to your measuring instrument via Bluetooth, up to a distance of 20 m.

The clearly structured measurement menu for volume flow enables the measuring instrument to be operated intuitively. 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 in the measuring instrument.

Particularly useful: press the button on the vane probe to operate the measuring instrument. For example, to store individual readings for multi-point mean calculation or to start and stop measurement series for mean calculation over time.

Hot wire probe – features

Use the fixed cable to connect the hot wire probe to the measuring instrument.

The probe is equipped with a telescope, which can be extended to a maximum length of 0.85 m. To ensure accurate measurement results, air density compensation is carried out via the integrated absolute pressure measurement.

The clearly structured measurement menu for volume flow makes the measuring instrument intuitive to operate. 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 in the measuring instrument.

Integrated sensor protection: when you are not using the hot wire probe, the rotatable protective cap protects the air velocity sensor from dirt and mechanical stress.

Kit for carrying out measurements in ventilation ducts and at air outlets: The testo 440 air velocity and IAQ measuring instrument, the vane probe (Ø 100 mm) with Bluetooth® including temperature sensor and the vane probe (Ø 16 mm) are all safely stowed away in the case. So you can get down to work straight away!

Vane probe with Bluetooth including temperature sensor – features

The readings of the vane probe are transmitted to your measuring instrument via Bluetooth, up to a distance of 20 m.

The clearly structured measurement menu for volume flow enables the measuring instrument to be operated intuitively. 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 in the measuring instrument.

Particularly useful: press the button on the vane probe to operate the measuring instrument. For example, to store individual readings for multi-point mean calculation or to start and stop measurement series for mean calculation over time.

Vane probe – features

Use the fixed cable to connect the vane probe to the measuring instrument. The probe is equipped with a telescope, which can be extended to a maximum length of 0.85 m. The immersion depth is easy to read off thanks to the scaling on the telescope.

The clearly structured measurement menu for volume flow makes the measuring instrument intuitive to operate. 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 in the measuring instrument.

With its handy format, pocket sized vane anemometer testo 410-2 is extremely suitable for fast check measurements at ventilation grilles and outdoors. With the permanently installed vane (diameter 30 mm), you can even measure low air velocities from 0.4 m/s to 20 m/s.
The anemometer is equipped with Testo humidity sensor featuring long-term stability and with an NTC temperature sensor with a measuring range of -10 to +50 °C for inspecting the air conditions. You can therefore use this to measure air temperature and humidity reliably. The anemometer testo 410-2 displays other parameters at the touch of a button: the dew point and wet bulb temperature as well as the Beaufort wind force and the wind chill temperature, which is the temperature perceived by a person due to wind-related cooling.

The anemometer offers useful accessories and functions

We have equipped the vane anemometer with a clip-on protective cap. This offers reliable protection if you are not using testo 410-2 straight away. During the measurement you can use the fitted wrist strap, which prevents the anemometer from falling.

Take a look at the useful functions offered by the anemometer testo 410-2:
Single-point averaging: calculation of the mean air velocity, for example at ventilation grilles (air outlets)
Hold function: enables the current measurement data relating to air velocity, humidity and air temperature to be recorded and compared with each other
Max/min values: displays the minimum or maximum values since the vane anemometer was last switched on or reset
Illuminated display: read off your readings quickly and easily, even if visibility is poor
Selectable units: air velocity: m/s, km/h, fpm, mph, kts and Beaufort; air temperature: °C, °F and wind chill; humidity: relative humidity, wet bulb and dew point temperature

The testo 410-1 vane anemometer is impressive thanks to its practical pocket size and is ideal for fast check measurements. With a measuring range of 0.4 to 20 m/s, the anemometer can even be used for low flow speeds.
The anemometer has a permanently mounted vane with a diameter of 30 mm. You can therefore use it for the integral measurement of air velocity at ventilation grilles (air outlets).
The anemometer is practical for outdoor operation: It not only measures air velocity and air temperature, but also calculates the Beaufort wind force and the wind chill temperature, which is the temperature perceived by a person due to wind-related cooling.
The vane anemometer with practical functions
The testo 410-1 includes a plug-on protective cap, as well as a wrist strap for secure measurement, and enables you to take advantage of the following functions:
Single-point averaging: The anemometer provides information on the average air velocity, e.g. at air outlets
Hold function: is used to record the current values relating to air velocity and air temperature and compare them with each other
Max/min values: get the minimum or maximum values since the anemometer was last switched on or reset, at the touch of a button
Illuminated display: read off your readings even in dark environments
Selectable units: for air velocity and temperature: m/s, km/h, fpm, mph, kts, Beaufort, °C, °F and wind chill

Testo 425 air velocity meter for quick, easy flow measurement

The testo 425 air velocity meter enables quick spot measurements in ventilation ducts. It records the flow speed, calculates the volumetric flow and also measures the temperature. With a measuring range of 0 to +20 m/s, this air velocity meter is particularly well suited to low air flow velocity.

The air velocity meter features a telescopic flow probe. The telescope can be extended to a length of up to 820 mm and has a probe head diameter of 7.5 mm.

Like the flow speed, would you also like to detect the volumetric flow on your air conditioning or ventilation system? This is no problem for the testo 425 air velocity meter. When you input the duct surface area, it automatically calculates the volumetric flow during the flow measurement. Single and multi-point averaging provides an indicator of the average volumetric flow, flow speed and temperature reading.

You can read off the current readings and the min/max and calculated mean value at any time on the illuminated display. Using the Hold button, you can freeze the current reading in order to compare it with another value, for example. If you should ever forget to switch off the air velocity meter, the Auto-off function will take care of this for you. This conserves your batteries and ensures that your air velocity meter is ready for use in the next measurement.

Equip yourself with accessories for the air velocity meter

To make sure that you are well-prepared for any circumstances, we recommend that when purchasing the air velocity meter, you also order our practical accessories: as an added option we offer a handy pocket, a transport case and also the TopSafe protective cover (to protect the air velocity meter from water, dirt and impacts).

Testo 405 thermal anemometer is a must-have. The thermal anemometer features a permanently mounted telescope and enables you to measure air flow, volumetric flow and air temperature. The measuring range for flow is between 0 to 10 m/s, volumetric flows are calculated up to 99,990 m3/h.

The extendible telescope (up to 300 mm) makes the thermal anemometer particularly suitable for flow measurements in ventilation ducts. The illuminated display can be swivelled into various positions, ensuring that the readings can be read off comfortably. The duct bracket (included in the delivery) offers key practical advantages. You can use this to optimally position the telescope in the ventilation duct and obtain precise measurement results.

Since the thermal anemometer testo 405 measures particularly accurately in the range between 0 and 2 m/s, you can also use it to measure the air velocity in rooms for checking indoor air quality. Low air velocities, at draughty windows for example, are quickly located and accurately measured using the thermal anemometer.

Integrated sensor protection: when you are not using the testo 405 thermal anemometer, the rotating protective cap protects the flow sensor from mechanical stress.