Calibration… What is it?

Calibration… What is it?

What is Calibration?

Simply put, a Calibration service is a process of checking the accuracy of a measuring instrument of any type and comparing the results to see if they are within an acceptable range. It can also include adjusting the instrument to bring it into alignment so it meets the standards. Eliminating or minimising factors that cause inaccurate measurements can help to maintain accuracy which is a fundamental aspect when monitoring.

Does it affect me?

Yes, the most precise measurement instrument is useless if you can’t be sure that it is reading accurately. Also if your business needs to comply with ISO standards then it is a requirement that records of the calibration of instruments are maintained and reviewed.

How is Calibration completed?

Calibration is completed by checking the instrument against known reference standards that have been calibrated themselves in a chain of measurements and can be tracked back to agreed International Standards.

How will I know if the Calibration is traceable?

By using an accredited service your calibration will be traceable. UKAS is the certification body authorised to accredit laboratories to the ISO17025 standard. This standard requires labs to demonstrate the capability in both the technical aspects of the measurements and in the quality assurance aspects.

How often should the instrument be calibrated?

This only depends on how important the measurements that are being made by the product or service are. Here at the Hanwell, we recommend you recalibrate and adjust (where appropriate) each year either at the Hanwell Calibration Service Centre or using our on-site calibration service.

If you have any other questions on our calibration service, contact us today.


  1. Rob Ummels

    We own 7 Hanwell 4106 devices and we want to calibrate them. The devices are strictly used for internal purposes. Can we calibrate the devices ourselves an want do we need to do it?

    Rob Ummels

    • Louise Jeffrey

      Hi Rob,
      Thank you for your enquiry. We can certainly help you with your request, therefore I have forwarded your details to a colleague of mine who will be in touch with you shortly.
      Have a great day.

  2. Elena Addison

    I am writing in regards to Notion Transmitter installed in the fridge. How often should the instrument be calibrated?

    • Zoe Hall

      Hi Elena,

      Thank you for your enquiry. How often it requires calibration will often depend on whether you need to adhere to internal/external guidelines or legal requirements. Most Hospitals and NHS Trusts will do so annually, although it does somewhat depend on what is being monitored.

      If you have further questions, please do not hesitate to contact us.

      Kind regards,

  3. Zachary Tomlinson

    I’ve been watching a couple of TV shows regarding manufacturing lately and I had no idea that measuring instruments are supposed to be calibrated. My friend is working as a rookie electrician and he’s been using a multimeter since he started. I should share this with him so he’d be aware that measurement calibrating is a way for him to ensure that he’d get the most accurate results from his instrument.

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