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Calibration of analytical measurands

Our calibration service in the field of analytical measuring instruments covers a diverse and complex range of different measurands and measuring instruments, which are used in almost all branches of industry.

An extensive and fully equipped analytical calibration laboratory is part of Testo Industrial Services. We carry out calibrations in the field of gas analyses and other chemical analyses completely independent of manufacturers. Gas analysis includes the calibration of gas detectors and gas leak and refrigerant testers. Calibration of pH, conductivity and frying oil testers are among the other chemical analyses. Here we calibrate your pH meters and conductivity meters with our high-precision equipment.

Our DAkkS accreditations in the analytical laboratory cover chemical and medical measurands in the field of conductivity and for pH values. Take a look at our accreditation certificate.

Your advantage: Our competence

  • Smallest measurement uncertainty for DAkkS calibrations in the pH range from 0.03 pH
  • Smallest measurement uncertainty for DAkkS calibrations in the conductivity range from 0.3 %
  • Calibration of CO-, CO2-environment measuring instruments

Our innovations:

  • Full DAkkS accreditation for conductivity and pH calibrations
  • Calibration of CO measuring instruments

Gas analysis

Gas analyses are carried out in many industries and sectors to investigate the composition of gases and gas mixtures. Testo Industrial Services has a fully equipped measuring station for the calibration of your gas analysis measuring instruments.

With the aid of reference materials or test gases whose composition is known very precisely and traceable within certain limits, a wide variety of concentrations of gas mixtures such as hydrogen, nitrogen or carbon monoxide can be calibrated.

Calibrations can be carried out on the calibration equipment for gas leak testers, gas detectors and refrigerant leak testers at 1 vol.% for methane (CH4) and on various leak rates at 3 g/a, 5 g/a and 10 g/a. The calibration of your CO2 measuring instruments  is carried out in the analytical laboratory at the measuring points 0 ppm, 1000 ppm and 5000 ppm. All portable electrical devices for the measurement of combustion parameters which are certified according to DIN EN 50379-1 are considered to be capable of calibration.

Gas analysis

For gas analyses we are specialized in the following measuring instruments:

  • Flue gas measuring devices
  • CO probes, CO measuring devices for ambient measurement
  • CO2 probes, CO2 measuring devices for ambient measurement
  • Refrigerant and glass leak testers (e.g. testo 316-4, R134a, CPS Leak-Seeker, INFICON D-Tec, Select Inficon, Rothenberger, 200HC)
  • Gas detectors (e.g. Dräger X-am® 2500, MSA Altair, Sewerin, Afriso)

Overview of the reference gases

Testo Industrial Services is able to perform a gas calibration with several predefined test gases with different concentrations:

  • O2: 1,5 Vol%, 2,5 Vol%, 5,0 Vol% 
  • CO: 100 ppm; 300 ppm, 400 ppm, 700 ppm, 5000 ppm,  
  • NO: 150 ppm, 300 ppm 
  • CO2: 17 Vol.% , 38,5 Vol% 
  • NO2: 100 ppm 
  • CH4: 5000 ppm, 10000 ppm (1 Vol%) 
  • H2S: 200 ppm 
  • SO2: 100 ppm 

Other chemical analyses

In addition to gas analyses, the analytical calibration laboratory of Testo Industrial Services also includes other chemical analyses. This area includes the measurands pH, conductivity and the calibration of frying oil testers.

Conductivity measurement

Conductivity measurements

The measurement of conductivity is used, among other things, for the control of the purity of water, for example also of deionized water in cooling circuits but also in connection with glucose oxidase for blood sugar measurement.

At our facilities, we can calibrate your conductivity meters at 1.3; 5; 15; 100; 700; 1413 μScm-1 or 100 mS/cm-1. In this case, the electrical conductivity is determined by means of a resistance measurement.

Calibration of pH measuring instruments

pH measurements

The measurement of the pH value provides a measure of the acidic or basic character of an aqueous solution and is used in many areas:

  • Food analysis / quality control
  • Research and development
  • Water analysis
  • Medicine

The measuring instruments for measuring the pH value can be calibrated at pH 2, pH 4, pH 7, pH 9, pH 10, pH 11.

Determination of TPM value

Frying oil measurement

Frying oil testers are used for quality assurance (determination of the degree of contamination) of frying oil. A frying oil tester measures the proportion of so-called "Total Polar Materials" (TPM) in the oil and indicates this as a percentage. Measuring instruments for measuring the TPM value can be calibrated at ± 4% TPM as well as ± 24% TPM. Frying oil testers have their field of application in:

  • Large kitchens, canteens, large catering companies
  • Food monitoring, food producers
  • Large restaurants & fast-food chains

Common manufacturers

The list of common manufacturers of pH and conductivity measuring instruments as well as frying oil testers, which we can operate, is extensive. The following overview offers a small excerpt:

  • WTW GmbH / Xylem Analytics
  • Greisinger GHM Group
  • Hanna Instruments Deutschland GmbH
  • Endress+Hauser Group Services AG
  • Ahlborn Mess- und Regelungstechnik GmbH
  • Extech Instruments
  • Hach Lange GmbH
  • Knick Elektronische Messgeräte­ GmbH & Co. KG
  • Thermo Fisher Scientific Inc.
  • Testo SE & Co. KGaA
  • VOLTCRAFT / Conrad Electronic AG

Success stories

We support you with your requirements and work towards your goals. Here you will find an overview of our most successful customer projects:


Know-how Calibration, qualification, validation


Our know-how summarised for you. Either find knowledge from our subject matter experts on the topic of analytical calibration directly in our Knowledge Centre or dive into an appropriate technical article on your topic. 

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