Temperature and Humidity Calibration

A UKAS ISO 17025:2017 accredited calibration laboratory for temperature and relative humidity.

Temperature and Humidity Calibration

A UKAS ISO 17025:2017 accredited calibration laboratory for temperature and relative humidity.

calibration equipment for UKAS calibration of temperature sensors

Tek Troniks provide UKAS calibration for medical, warehousing, production and food retailers both at our laboratory and onsite.

We're UKAS accredited for temperature and humidity calibration and also provide a range of UKAS traceable calibration services.

Our in-house laboratory and on-site calibration procedures are accredited to the highest industry standards (UKAS ISO/IEC 17025:2017) for temperature and relative humidity.

Contact us to discuss your calibration requirements



What is calibration?

Calibration provides confidence that the temperature displayed on devices is reflective of actual temperatures in the areas being monitored. It is an essential process for environments storing temperature sensitive goods.

Calibration has always been common place in medical facilities and pharmaceutical storage but has become a requirement in a variety of applications across food production, storage and retail industries.

calibration target symbol

Long term calibration contracts

For peace of mind, we recommend our fixed term calibration contract. You can budget up to three years in advance on dates that fit within your calendar – whether it’s for on-site testing or at our in-house laboratory.

Speak to our calibration team for more information and advice on temperature and humidity calibration.

We also provide.....


Wireless Monitoring Systems

Enviromental wireless monitoring systems with high accuracy sensors

Wireless Monitoring Systems

We supply real time automated wireless temperature monitoring systems, with alarm management, for Food Service, Retail, Production, Medical and the Warehousing & Storage of temperature sensitive goods.

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Temperature mapping sensor grid layout

Temperature Mapping

Temperature mapping service for chilled, ambient, warehouse storage and production areas.

Temperature Mapping

UKAS accredited ISO 17025:17 mapping service for storage rooms, temperature controlled warehouses, cold rooms, server rooms and laboratories.

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Frequently asked questions about calibration

How often do I need to calibrate?

Manufacturers of sensors will have a recommended re-calibration period; for Tek Troniks temperature and humidity probes we recommend annual re-calibration.

However, the manufacturers recommended period cannot override any legislative, performance, contractual or audit defined calibration requirement.

If you're using probes for critical applications more frequent calibration would be the norm.

If the probe is damaged, dropped or is generally mishandled then a calibration to check performance should be completed.

Periodic checking of the probe against a known source to sense check performance should also be completed.

If you have any concerns over performance of the probe then calibration should be carried out.

What is an acceptable deviation?

The acceptable deviation of a temperature or humidity probe will depend on; your specific application requirement, legislation for your industry/sector, performance defined internally, by your regulatory body or by your customers.

As a manufacture we are commonly asked by customers for temperature probes that are accurate to within ±0.5°C.  This implies that if you have an area that is at 5°C then your happy with a temperature probe reading of between 4.5°C and 5.5°C.

Understanding deviation

When calibrating a probe at 5°C the calibration house will specify the error seen in the probe and their uncertainty in the measurement they have taken.

If the measured reading is 5.3°C and their uncertainty is ±0.3°C then they are saying that they are 95% confident that the accuracy of the reading taken is between 5°C and 5.6°C.

At 5°C the deviation would be acceptable, at 5.6°C it would fail the ±0.5°C requirement.  Therefore with this measurement and this uncertainty the probe would be deemed to be beyond the acceptable deviation level.

Common mistakes (Based on the above area at a temperature of 5°C)

In industry it is often assumed that when an employee tests a probe against a known source (hand held thermometer) and they get a reading of 5.5°C then all is good, the probe is within its deviation limit.

However this may not be the case, unfortunately they have not allowed for the uncertainty of the reading being taking and have little or no knowledge of how the uncertainty is calculated. See the next FAQ for more about Measurement Uncertainty.

Self checking using a known source is great for checking performance of probes periodically, however to know your true deviation, calibration is required and you should use a UKAS calibration house, like Tek Troniks..


What is measurement uncertainty?

We all see measurement uncertainty on calibration certificates and often have little understanding of what it means or how it's calculated.

In everyday life we will come across situations where we have doubt, if asked how hot you think it is you might say about 24°C, the about shows your uncertainty, you think it might be 24°C but without measurement you're not sure.

Calibration uncertainty is putting some scientific endeavour behind this doubt.  Its giving a quantitative value to each element of doubt and to put a limit to the level of uncertainty.

The inputs for doubt vary based on the kind of calibration being undertaken, with temperature it can be;

  • the accuracy of the thermometer used to take the reading
  • the calibration uncertainty on this thermometer
  • the drift in the thermometer since last calibration
  • the change in temperature within the environment whilst taking the measurement
  • the ability to read the output correctly
  • if the reading fluctuates
  • plus many more

Once all doubt inputs are accounted for and calculations made for each, an overall figure can be calculated that represents uncertainty.

As a UKAS calibration house are required to calculate our uncertainty for every calibration we complete, this uncertainty is expressed on our certificates as a ± figure which is a factor of K=2, providing a coverage probability of approximately 95%.

The uncertainty of our measurement underpins our whole calibration performance and is a key part of our documentation audited, annually, by UKAS

For more information on Measurement Uncertainty see UKAS doc: M3003 - The Expression of Uncertainty and Confidence in Measurement

What is traceability?

Traceability is the term used to refer to an unbroken history of comparisons relating to the calibration equipment's measurement to a known standard.

To calibrate with confidence and to calculate our uncertainty budgets, it is imperative we have accurate knowledge of the performance of our equipment.  This is done by comparison to the national standard.

Our UKAS 17025 calibration processes document how these traceable comparisons are completed and is audited to show our strict compliance.

The UKAS 17025 accreditation provides tractability of measurement to the SI system of units and/or to units of measurement realised at the National Physical Laboratory or other recognised national meteorology institutes.


Do I have to calibrate to UKAS standards?

The standard of adherence for calibration will depend on your application, industry, sector and audit requirements.

The honest answer may be you require calibration but not the UKAS standard. Though we supply non-UKAS calibration services we always ask why you want to take this option?

The compliance to the UKAS ISO/EC 17025 standard should give you confidence that the calibration being completed is done to;

  • the highest standard
  • to strictly audited processes
  • with equipment that meets the needs to complete comparisons accurately
  • with calculated uncertainties that can be trusted
  • the work completed by audited, trained professionals.

Have more questions? Contact us for more information.