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Testo 440-dP air velocity and IAQ measuring instrument, 3 x AA batteries, USB cable and calibration protocol

Differential Pressure Measuring Instrument - Testo 440-dP
Model No: Testo 440-dP Part 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.

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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Testo 510 differential pressure measuring instrument, including silicone connection hose, protective cap, calibration protocol, belt pouch and batteries

Differential Pressure Meter - Testo 510
Model No: Testo 510 Part No: 0563 0510

Testo 510 differential pressure measuring instrument. Can help you maintain and install systems in the sanitary and HVAC sector. Differential pressure measurement and flow measurements in ventilation ducts using a Pitot tube

  1. Differential pressure measurement 0 to 100 hPa
  2. Flow velocity measurement possible with Pitot tube
  3. Temperature and air density compensation
  4. Display illumination
  5. 10 selectable units


With the testo 510 differential pressure measuring instrument, heating installers and air conditioning engineers will be well-equipped to carry out their work: the instrument measures differential pressure from 0 to 100 hPa and can help you check filters on air conditioning systems or measure static gas and gas flow pressure on heating systems, for example.

The following units can be selected on the testo 510 differential pressure measuring instrument: 

Pa, hPa, mbar, mmH2O, mmHg, inH2O, inHg, psi, m/s, fpm

In addition, you can measure the flow in the ventilation duct with a Pitot tube that is available as an option – from 10 to 100 m/s.

Practical and precise: key advantages offered by the differential pressure measuring instrument

  • Precise: the differential pressure measurement has temperature and air density compensation for accurate readings
  • Uncomplicated: small, handy and easy to operate with just three buttons
  • Clever: you can work with your hands free thanks to magnets on the rear of the instrument. When there is poor visibility, such as in dark surroundings, the illuminated display makes it easier for you to work
  • Reliable: a belt pouch and plug-on protective cap mean the differential pressure measuring instrument can be safely stowed away and it is also well-secured during measurement thanks to a wrist strap
  • Ready to go: the silicone connection hose is included in the testo 510 set. So you can start your measurements straight away
Differential Pressure - Piezoresistive
Measuring range 0 to 100 hPa
Accuracy ±0.03 hPa (0 to 0.30 hPa), ±0.05 hPa (0.31 to 1.00 hPa), ±(0.1 hPa + 1.5 % of mv) (1.01 to 100 hPa)
Resolution 0.01 hPa
General technical data
Operating temperature 0 to +50 °C
Storage temperature -40 to +70 °C
Maximal static pressure 500 mbar
Selectable units hPa, mbar, Pa, mmH2O, inH₂O, inHg, mmHg, psi, m/s, fpm
Battery type 2 AAA micro batteries

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Testo 512-1 differential pressure measuring instrument, calibration protocol, batteries

Diff. Pressure Measuring Instrument (0-2 hPa) - Testo 512-1
Model No: Testo 512-1 Part No: 0560 5126

Testo 512-1 Differential Pressure Measuring Instrument, Measuring range 0 to 2 hPa. Air flow Velocity measurements between +2 to +17.5 m/s by using Pitot Tube

  1. 8 pressure units can be selected: kPa, hPa, Pa, mm H2O, mmHg, psi, inch H2O, inch Hg
  2. 2 flow velocity units can be selected: m/s, fpm
  3. Max./min. as well as Hold-function
     


The testo 512 with a measuring range from 0…2 hPa can be used to help you carry out quick and easy filter checks when performing differential pressure checks on ventilation and air conditioning systems. Differential pressure measurements are carried out to determine whether filters still work properly or whether they are used up and clogged and need to be replaced.

The differential pressure meter is ideal for carrying out pitot static tube measurements in air ducts at very high air flow speeds or when the air stream is strongly polluted. The compact, rugged meter shows both the pressure as well as the air flow speed and has a measuring range from 2 to 17,5 m/s.
The damper for adjustable averaging can be programmed individually while the density compensation is already integrated.

The pitot static tube that you will need to carry out your air flow measurements can be ordered together with your differential pressure meter. Choose from one of three models to select the model that is best suited to your individual requirements. The pitot static tube is inserted into the air duct where it measures the air flow quickly and reliably.

The testo 512 displays the pressure and the air flow speed simultaneously. You can choose between two different units of measurement - m/s and fpm - to indicate the air flow speed and from eight different units - psi, kPa, hPa, Pa, mm H2O, mmHg, inch H2O and inch Hg - to measure the pressure.

Differential Pressure - Piezoresistive
Measuring range 0 to +2 hPa, +2 to +17.5 m/s, 395 to 3445 fpm
Accuracy 0.5 % fs
Resolution 0.001 hPa, 0.1 m/s, 0.1 fpm
Overload ±10 hPa
General technical data
Operating temperature 0 to +60 °C
Storage temperature -10 to +70 °C
Battery type 9V block battery

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Testo 512-2 differential pressure measuring instrument, calibration protocol, batteries

Diff. Pressure Measuring Instrument (0-20 hPa) - Testo 512-2
Model No: Testo 512-2 Part No: 0560 5127

Testo 512-2 Differential Pressure Measuring Instrument, Measuring range 0 to 20 hPa. Air flow Velocity measurements between +5 to +55 m/s by using Pitot Tube

  1. 8 pressure units can be selected: kPa, hPa, Pa, mm H2O, mmHg, psi, inch H2O, inch Hg
  2. 2 flow velocity units can be selected: m/s, fpm
  3. Max./min. as well as Hold-function


The testo 512 pressure measuring instrument with a measuring range from 0…20 hPa helps you carry out quick and easy filter checks while inspecting differential pressure in ventilation and air conditioning systems. Measuring differential pressure aids determining if the filters are functioning properly or need to be replaced.

Testo 512 is ideal for carrying out pitot static tube measurements in air ducts at very high air flow speeds or when the air stream is strongly polluted. The compact, rugged meter with a measuring range from 5 to 55 m/s shows both pressure as well as air flow speed.
The instrument has a pre-integrated density compensation while the damper can be programmed individually for adjustable averaging.
The pitot static tube for carrying out air flow measurements can be ordered together with the testo 512. You may select the model that is best suited to your individual requirements from the three available models. The pitot static tube is inserted into the air duct for measuring the air flow quickly and reliably.

The testo 512 pressure measuring instrument is equipped for simultaneous display of pressure and air flow speed. You can choose between two different units of measurement - m/s and fpm - to indicate the air flow speed and from eight different units - psi, kPa, hPa, Pa, mm H2O, mmHg, inch H2O and inch Hg - to measure the pressure.

Differential Pressure - Piezoresistive
Measuring range 0 to +20 hPa, +5 to +55 m/s, 985 to 10830 fpm
Accuracy 0.5 % fs
Resolution 0.01 hPa, 0.1 m/s, 0.1 fpm
Overload ±200 hPa
General technical data
Operating temperature 0 to +60 °C
Storage temperature -10 to +70 °C
Battery type 9V block battery

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Testo 512-3 differential pressure measuring instrument, calibration protocol, batteries

Diff. Pressure Measuring Instrument (0-200 hPa) - Testo 512-3
Model No: Testo 512-3 Part No: 0560 5128

Testo 512-3 Differential Pressure Measuring Instrument, Measuring range 0 to 200 hPa. Air flow Velocity measurements between +10 to +100 m/s by using Pitot Tube

  1. 8 pressure units can be selected: kPa, hPa, Pa, mm H2O, mmHg, psi, inch H2O, inch Hg
  2. 2 flow velocity units can be selected: m/s, fpm
  3. Max./min. as well as Hold-function


The testo 512 with a measuring range from 0…200 hPa can be used to help you carry out quick and easy filter checks when performing differential pressure checks on ventilation and air conditioning systems. Differential pressure measurements are carried out to determine whether filters still work properly or whether they are used up and clogged and need to be replaced.

The differential pressure meter is ideal for carrying out pitot static tube measurements in air ducts at very high air flow speeds or when the air stream is strongly polluted. The compact, rugged meter shows both the pressure as well as the air flow speed and has a measuring range from 10 to 100 m/s.

The damper for adjustable averaging can be programmed individually while the density compensation is already integrated.

The pitot static tube that you will need to carry out your air flow measurements can be ordered together with your differential pressure meter. Choose from one of three models to select the model that is best suited to your individual requirements. The pitot static tube is inserted into the air duct where it measures the air flow quickly and reliably.

The testo 512 displays the pressure and the air flow speed simultaneously. You can choose between two different units of measurement - m/s and fpm - to indicate the air flow speed and from eight different units - psi, kPa, hPa, Pa, mm H2O, mmHg, inch H2O and inch Hg - to measure the pressure.

Differential Pressure - Piezoresistive
Measuring range 0 to +200 hPa, +10 to +100 m/s, 1970 to 19690 fpm
Accuracy 0.5 % fs
Resolution 0.1 hPa, 0.1 m/s, 0.1 fpm
Overload ±2000 hPa
General technical data
Operating temperature 0 to +60 °C
Storage temperature -10 to +70 °C
Battery type 9V block battery

Delivery Scope

Testo 512-4 differential pressure measuring instrument, including calibration protocol and batteries

Diff. Pressure Measuring Instrument (0-2000 hPa) - Testo 512-4
Model No: Testo 512-4 Part No: 0560 5129

Testo 512-4 Differential Pressure Measuring Instrument, Measuring range 0 to 2000 hPa.

  1. 7 pressure units to choose from: kPa, hPa, mm H2O, mmHg, psi, inch H2O, inch Hg
  2. Large measuring range up to 2000 hPa
  3. Min./Max. Value display, hold function


The testo 512 differential pressure measuring instrument can be used to perform differential pressure measurements in a measuring range of 0 to 2000 hPa.

The damping for moving averages is adjustable. The actual value shown can be held on the display by pressing the HOLD button. The measured minimum and maximum value can be displayed and stored on the instrument.

You can display measuring values from your differential pressure measurements in any of the 7 possible units: kPa, hPa, mm H2O, mmHg, psi, inch H2O and inch Hg. The values can be viewed easily on the large illuminated display of the differential pressure measuring instrument.

Accessories for the differential pressure measuring instrument: further practical advantages

With our optional accessories, you are investing in the durability of the instrument and will benefit from practical use: the handy bag ensures safe storage and transportation of the differential pressure measuring instrument. The TopSafe protective case protects the instrument against impact, dirt and spray water.

With the testo fast printer, you can print out measurement protocols directly on site. Data transfer is carried out easily via infrared.

Differential Pressure - Piezoresistive
Measuring range 0 to +2000 hPa
Accuracy 0.5 % fs
Resolution 1 hPa
Overload ±4000 hPa
General technical data
Operating temperature 0 to +60 °C
Storage temperature -10 to +70 °C
Battery type 9V block battery

Delivery Scope

testo 521-3 differential pressure measuring instrument, including calibration protocol and batteries

Diff. Pressure Measuring Instrument (0-2.5 hPa) - testo 521-3
Model No: testo 521-3 Part No: 0560 5213

Testo 521-3 high-precision differential pressure measuring instrument easily determines even the smallest differential pressures (up to +2.5 hPa). Its high accuracy and a resolution of 0.1 Pa make the instrument ideal for differential pressure measurements in clean rooms or for flue inspections.

  1. Integrated temperature-compensated differential pressure sensor with accuracy of up to ± 0.5 Pa
  2. Calculation of the flow velocity and the volume flow via Pitot tube (optional)
  3. Direct zeroing of the display values of pressure probes
  4. 2 probe inputs for additional pressure and temperature probes


The testo 521-3 differential pressure measuring instrument is designed for high-precision differential pressure measurements in air conditioning and ventilation technology. It can be used, for example, for measurements in clean rooms and for flue inspections – thanks to a high level of accuracy and outstanding resolution. In conjunction with a Pitot tube (optional), the integrated pressure sensor measures flow velocities of +1 to +20 m/s.
The integrated temperature-compensated differential pressure sensor performs measurements to an accuracy of up to ± 0.5 Pa. In addition, you can attach up to 2 further optional probes to the measuring instrument. This means you can flexibly adapt the differential pressure measuring instrument to your application. You have the choice of the following probes:

  1. Differential pressure probes
  2. Absolute pressure probes
  3. Relative pressure probes
  4. Temperature probes (e.g. surface probes or immersion and penetration probes)

The practical features of the testo 521-3 differential pressure measuring instrument

The integrated differential pressure sensor enables the testo 521-3 measuring instrument to calculate flow velocity and volume flow using a Pitot tube (which can be ordered separately). The differential pressure measuring instrument also offers timed and multi-point mean calculation.
The optional ComSoft software enables you to save the measurement data so that it is linked to the measuring location and analyze it on the PC. You can use the optional testo fast printer to print out measurement data directly at the measuring location.
You can choose between the following units for pressure measurement: mbar, hPa, bar, Pa, kPa, inH2O, mmH2O, torr and psi. The mean value, the last measured value and the min./max. values can be displayed at the press of a button.

Temperature - NTC
Measuring range -40 to +150 °C
Temperature - TC Type K (NiCr-Ni)
Measuring range -200 to +1370 °C
Differential pressure (internal sensor) - Piezoresistive
Measuring range 0 to 2.5 hPa
Static pressure 1000 hPa
Differential pressure (external probe) - Piezoresistive
Measuring range 0 to 2000 hPa
Differential pressure (external probe) - Ceramic
Measuring range -1 to 400 bar
General technical data
Connection Hose: inner Ø 4 mm outer Ø 6 mm
Battery type 9 V (6LR61)
Battery life Continuous operation w/ internal pressure sensor: 30 h; With rech. battery: 10 h; With carbon battery: 18 h
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