testo Calibration

What is testo Calibration?

Calibration involves the comparison of the reading by the instrument being calibrated with that of a reference instrument (also called reference standard) in specific conditions.

Other important aspects of calibration include documenting the deviation recorded between the measuring instrument being investigated and the reference standard, calculating the resulting measurement uncertainty and creating the calibration certificate recording this uncertainty.

The Testo calibration lab has state of the art reference equipment and technology to ensure we complete your calibration with a quick turnaround of five to ten business days and keep your instruments reading spot on.

We also store your previous calibration certificates on our server so if you happen to lose it feel free to call us and we can retrieve a copy for you.

Our Testo Calibration Experts consist of qualified Engineers who are specialized to both calibrate and adjust where possible your Testo equipment using proprietary software available at our laboratory.

All of our calibration experts specialize in Testo instruments. This allows us to ensure that you, as a Testo customer, will receive their full attention. They are well trained and are available to answer any questions you may have.

Our temperature and humidity laboratories are SANAS accredited.

Service and Calibration Request

What next? 3 easy steps:

  1. Fill out our online request form
  2. We will contact you
  3. Send us your product

Complete our calibration customer survey

We appreciate your feedback:

Please let us know how we can improve our service

What is included in a testo calibration:

  • Pre-calibration check
  • Calibration
  • SANAS calibration certificate
  • Yearly calibration reminder


Parameter Testo Calibrates


We can conduct immersion, infrared and air temperature calibrations on our full range of Testo temperature instruments from data loggers with both internal and external sensors, immersion/penetration probes and infrared non-contact measuring instruments all the way to highly accurate Pt100 sensors. We have state of the art equipment that is capable of generating controlled temperatures from -30 to +200 °C. This is suitable for calibrating measuring equipment used at the negative temperature range for freezers, mid temperature range for fridges and ambient monitors all the way to high temperature sensors in ovens and other devices.


Our Testo calibration experts use a specialized highly accurate Testo Humidity chamber to generate a spatially uniform controlled Humidity between 5%rH and 95%rH and Temperatures between 10 °C and 40 °C to calibrate and test your Testo equipment. Intensive testing is conducted as part of the calibration for up to 4 hours and adjustments can be made on your Testo Humidity instrument in conjunction with our Testo proprietary software.

Flue gas

Testo recommends that analyzers be calibrated at least once a year for normal use and more often if the analyser is used frequently with longer measurements at higher concentrations.
Our service department uses the latest Testo software to diagnose and service your Testo flue gas analyser with worn parts replaced from our spare part stock holding.
We are able to calibrate O2,CO,CO2,NO,NO2, H2S & HC cells against high accuracy references using specialist equipment.


We can to offer you calibration service for other parameters.

  • Pressure
  • Velocity
  • Light/Lux
  • Sound
  • Flow