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Calibration of flow measurement variables

In our calibration laboratory for flow measurement variables, we carry out manufacturer and media-independent calibrations of gaseous and liquid media as well as flow velocity.

Industrial flow measurement is becoming increasingly important due to requirements for consistent product quality as well as safety, process optimization and environmental protection. Due to the wide range of flowmeters, measurement methods and media, standardization of measurement technology is rare. Consequently, an individual solution is also required for calibration.

From test stand design to software development - highly specialized flow experts with years of experience have built up the flow laboratory of Testo Industrial Services with the highest level of know-how. The versatility of flowmeters used in industry requires a wide range of test rigs and calibrators. Nine specially designed liquid and gas calibrators guarantee you rapid calibration of different flow rates and media. In addition to calibration, we also offer adjustment, programming, linearization, configuration with original manufacturer software as well as extensive testing possibilities for prototypes. With our open wind tunnel, we are also able to carry out accredited calibration for flow velocity.

We are also specialized in the calibration of Testo volume flow hoods thanks to the many years of experience of the entire Testo Group. High-precision measuring methods ensure reliable measured values during calibration.

Your advantage: Our competence

  • Manufacturer-independent: no dependencies and absolute neutrality
  • Medium independent: Your process fluid in our calibrators
  • Countless adaptation possibilities (if necessary special designs according to your requirements)
  • Perfect quality assurance thanks to the overlapping measuring ranges of our calibrators
  • Accredited for all three measured variables in the area of flowing media

Insight into our flow-through laboratory

Our flow laboratory is characterized by an incredibly high number of measuring principles for flow meters. We always calibrate your devices individually for each customer to meet the requirements of your processes. Convince yourself of our extensive service portfolio.

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In a wide variety of industries, flow measurements of liquids directly determine production operations and quality. Testo Industrial Services has six specially designed test benches that enable calibration of flow meters for liquids from 0.15 ml/min to >300m3/h. We can use adaptations up to a nominal diameter of DN 80 for calibration.

In order to be able to simulate your process almost perfectly during calibration, we generate a calibration liquid with the identical viscosity as you find in your process, or we can also use your own adaptation options. This ensures that the measurement results you find on the calibration certificates can be transferred one-to-one into your process. In addition to water, calibration can therefore also be carried out with alcohol or various oils, for example. Our highly specialized personnel will generate the viscosity of your individually used fluid according to your requirements from 0.8 mm²/s to 1,600 mm²/s or use your process fluid in our calibrators. In addition to calibration, we also offer to carry out any necessary adjustments.

Calibration of flow meters on the water test bench

In the field of flow of liquids we are specialized in the following measuring instruments:

  • Gear counter
  • Oval Wheel Meter
  • Spindle flow meter
  • Piston flow meter
  • Swash plate
  • Turbine and impeller flow meters
  • Ultrasonic flowmeter
  • Coriolis flow meter


The determination of flow for air and inert gases plays a decisive role in many industrial sectors and is often used directly for quality assurance measures.

Testo Industrial Services can calibrate your flow meters for gases from approx. 1 ml/min up to 900 m3/h with a measurement uncertainty of up to 0.22 % of MW. We can optionally use the adaptations used in your process. Our test rigs are based on the technology of laminar flow elements (LFE), critical nozzles or piston displacers.

The different procedures and designs of our test benches enable, among other things, calibrations for flow meters with a strong pressure dependency. Maximum inlet pressures of up to 14 bar can be achieved. It is also possible to calibrate with gases other than air. In addition to calibration, the performance an adjustment is possible if necessary.

Calibration of gases in the flow laboratory

In the field of gas we are specialized in the following measuring instruments:

  • Piston flow meter
  • Gas clocks
  • Turbine and impeller flow meters
  • Thermal mass flow meters
  • Laminar Flow Elements (FLE)
  • Leak calibrators
  • Lick Sniffers

Flow velocity

In a specially developed wind tunnel, Testo Industrial Services calibrates your flow measuring instruments using the most accurate and reliable flow measuring method - laser Doppler anemometry (LDA). This LDA measuring method is characterized by its contactless and thus interference-free measurement, so that a high measuring accuracy of the respective measured flow velocity can be guaranteed. Flow probes of different types can be calibrated in this channel from 0.1 to 68 m/s with a measurement uncertainty of 0.5%.

Calibration of flow in the wind tunnel

In the field of flow velocity flow we are specialized in the following measuring instruments:

  • Hot-wire anemometer
  • Vane anemometer
  • Heat Sphere Anemometer
  • Pitot tube
  • Volumetric flow meter

Calibration of volume flow hoods

If technical gases, liquids or compressed air are used in companies, precise consumption measurement using various volumetric flow meters is essential. With our many years of experience in the field of measurement technology through the Testo Group, we calibrate the volumetric flow measuring hood such as Testo 420 with up to 1800 m3/h in another specially designed wind tunnel.

Your contact person

Do you have any questions or would you like more information on calibrating flowmeters? Our expert, Michael Rehder, will be happy to answer any questions you may have.

Portrait des Mitarbeiters Michael Reder

Michael Rehder

Product manager process measurement technology
with focus on flow

Success stories

We support you in your projects and are committed to your goals. Here you will find an excerpt from the references of our successful projects:

Our references

Know-how Testo Industrial Services GmbH


Our know-how summarized for you:
In our Knowledge-Centre you will find helpful know-how from our experts or dive into interesting technical articles about calibration. 

Our scope of services for you

Our scope of services includes standard ISO calibrations as well as accredited DAkkS calibrations. Here you will find an excerpt of the services we offer in our laboratories and at your site.

Measured variable Flow rate of liquids: Flow meters, Displacement meters, dynamic pressure probes, and much more.Calibration DAkkS-accredited*On-site calibration
Calibration of displacement meters (gear meters, oval gear meters, spindle flow meters, piston flow meters, swash plate etc.)
Calibration of volumetric flow meters: Magnetic inductive flowmeters (EMF), variable area flowmeters, turbine and impeller flowmeters, ultrasonic flowmeters (inline & clamp-on, vortex, etc.)
Calibration of differential pressure based principles: Orifice plate, pitot tubes, venturi etc.
Calibration of mass flow meters: Coriolis flow meter
Measured variable Flow rate of gases: Piston flow meters, impeller flow meters, laminar flow elements (LFE), etc.Calibration DAkkS-accredited*On-site calibration
Calibration of displacement meters: Piston flow meters, bellows gas meters, experimental gas meters, gas meters
Calibration of volumetric flow meters: Variable area flowmeter, turbine flowmeter, impeller flowmeter, vortex, etc.
Calibration of mass flow meters: Coriolis flowmeters; Thermal mass flowmeters (MFM, MFC)
Calibration of differential pressure based principles: Orifice plate, laminar flow elements (LFE), orifice plate, test leaks & test leaks, leak calibrators, leak sniffers
Measured variable Flow & Volume flow: Hot-wire anemometer, impeller anemometer, volumetric flow meter, etc.Calibration DAkkS-accredited*On-site calibration
Calibration of hot-wire anemometer
Vane anemometer calibration
Calibration of heat ball anemometer
Calibration of half shell anemometer
Calibration of pitot tube
Calibration of volume flow meter

*Due to the variety of flow meters, an individual evaluation of the feasibility of laboratory and on-site calibrations is necessary. Our experts advise You with pleasure! 


To read

Take a look at our topic-specific brochures and learn more about the calibration of your thermodynamic measuring instruments: