Calibration Services

To complement the production facilities of S. Brannan & Sons, a comprehensive calibration service is available for a variety of instruments including thermometers, pressure gauges, hydrometers and environmental meters; either UKAS Accredited or certification Traceable to National Standards.

This service is available, for an additional cost, at time of product’s purchase or for customers own existing instruments. Please contact our Sales Team to discuss the suitability of your instrument for calibration.



The table below shows instruments available for calibration.


Instrument Type

UKAS Accredited

Traceable To National Standards

Liquid in Glass Thermometers
Dial Thermometers
Electronic Thermometers with Indicators
Measurements of Temperature in Air
Surface Temperature
Infrared Thermometers
Environmental Meters (sound, light, wind speed, hygrometers)
Pressure Gauges/Instruments


*UKAS Calibration of hydrometers carried out at external laboratory

All of our prices are competitive and quantity discounts apply. Please contact us for further details

Calibration Frequently Asked Questions

What is a Calibration?

  • A calibration is a procedure in which an instrument is tested to make sure it conforms to a recognised standard and is used to verify the accuracy of an instrument.
  • It is the process of checking, by comparison with a standard, the accuracy of a measuring instrument and provides accurate corrections which can be applied to the readings obtained in use.


Why should I calibrate my instrument?

  • By comparing an instrument of a known value against a second instrument (unit under test), the difference can be calculated and suitable corrections determined.
  • A calibration provides the user with confidence that the instrument they are using works correctly.
  • Without periodic calibration, an instrument can drift out of the manufactures specification unrecognised and lead to incorrect test results.


What instruments are you able to calibrate?

  • We are able to calibrate the vast majority of products we sell, as well as calibrating your own instrument. The table above shows all instruments we are able to calibrate. If you have any doubt about whether or not your instrument is suitable for calibration, please contact our sales team on 01946 816600 or


I want to buy a new product with calibration certificate, what range of instrument should I buy?

  • When buying a new instrument, the point of interest should be between the centre and the 3/4 mark of the scale.
  • If for example a pressure gauge is required to measure a line pressure of 10 bar, a 0-10 bar gauge will be able to make the measurement, but a 0-16 bar gauge will give arguably more accurate readings and will be less likely to suffer from small pressure spikes and over pressure issues.


What is the difference between a UKAS Calibration and a Traceable Calibration

    • UKAS (United Kingdom Accreditation Service) is the sole body recognised by HM Government for assessing and accrediting the competence of calibration and testing laboratories to (BS) EN ISO/IEC 17025:2005 – ‘General requirements for the competence of testing and calibration laboratories’.

-- We have been accredited by UKAS to perform calibrations relating to temperature and pressure instruments.

-- Our calibration lab has been assessed against internationally recognised standards to demonstrate our competence, quality, and performance capability.

  • Traceable Calibrations are conducted according to similar standards, which ensure the calibration results are correct; however an official governing body such as UKAS does not approve the results and uncertainties are not stated.
  • All our Traceable Calibrations are traceable to National Standards and the calibration process is carried out following documented procedures.


How often should my instrument be calibrated?

  • We recommend getting your instrument calibrated yearly, however the calibration frequency for a specific instrument is up to the individual customer. It should be based on:

-- The environment in which the instrument is used,

-- The frequency of use,

-- Any evidence of changes or trends in calibration data and the level of confidence required in the readings.

  • The customer must decide what is the consequence of an incorrect reading?

-- If you waste a batch of wine due to an incorrect temperature reading, the consequences are probably far less than if you are performing a scientific experiment to formulate a new drug.

  • Has the device been subjected to any misuse or obvious damage? If the thermometer is used out on site it is perhaps more likely to become damaged or knocked than if were kept in a cupboard in the laboratory between use.


How many calibration points should I choose & what specific points?

  • Calibration points can be drawn on a graph and joined together to form a calibration curve. This therefore allows the user to estimate the corrections at points where a calibration value has not been measured.

-- More calibration points will reduce estimation errors, but each calibration point chosen will incur a cost, so the number chosen will be a trade-off between accuracy and cost.

  • It is preferable for the customer to consider what points the calibration should be carried out at and specify these at the time of request. Calibration points should either be:

-- Specific to your process, such as -18°C, 0°C and 4°C for fridges and freezers

-- Or cover a minimum of 80% of the range of instrument if it is for general purpose use. For example a -10°C to 110°C thermometer can easily be calibrated at 0°C, 50°C and 100°C.

  • The number of points checked will again be determined by the intended application. If the thermometer is used to check a single point (e.g. 10°C), then only that point need be checked. However, it may be preferred to select a small range around a point (e.g. 9°, 10° & 11°C).
  • Our standard calibrations offer a 5 point calibration across a minimum of 80% of the instruments range.


What is Uncertainty of Measurement on my UKAS calibration certificate?

  • UKAS accreditation requires that estimates of the maximum errors during the calibration are displayed on the certificate.
  • Uncertainty of measurement is the doubt that exists from the result of the calibration. People assume that well made instruments should be trustworthy and give correct answers, but for every measurement there is always a margin of error.
  • The uncertainty of measurement on our UKAS calibration certificates arises from many different factors such as uncertainties with our calibration equipment, materials used, and environmental conditions.
  • UKAS certificates state the maximum probable uncertainty associated with all aspects of a calibration with a confidence level of 95%. These uncertainties are quoted on UKAS certificates and can be used as part of the uncertainty budget for your measuring system.


Do you offer NIST calibrations?

  • Through the International Laboratory Accreditation Cooperation (ILAC) agreement our UKAS accredited calibrations are to the same international standard that NIST calibrations are performed. Although we cannot issue a NIST calibration certificate our UKAS certificates are to the same standard, only using the UK alternative.
  • The ILAC agreement ensures our UKAS calibration certificates are recognised around the world.


How do I arrange for my instrument to be calibrated?

To prevent delays, contact the sales office on 01946 816600 or with the following information:

  • Company (if applicable):
  • Contact Name:
  • Address:
  • Contact Telephone Number:
  • Contact Email:
  • Instrument Type:
  • Purchase Order Number:
  • UKAS or Traceable:
  • Number of Calibration Points Required: (if not stated we will carry out our standard calibration using 5 points)
  • Specific Points Required: (if none are given the calibration staff will select the points, ensuring points are selected evenly across a minimum of 80% of the instruments range.


Where should I send my Instrument?

  • All items requiring calibration should be shipped to the following address along with a copy of the purchase order or similar documents allowing us to identify your instrument:
  • S. Brannan & Sons Ltd Calibration Laboratory
    Leconfield Industrial Estate
    Cleator Moor
    CA25 5QE


How should I return my instrument for calibration?

  • For liquid in glass thermometers we are able to supply packaging for use when sending your thermometer to us to help reduce the risk of breakage during transit. The pack comprises of a box with a blank calibration label, a telescopic plastic tube, and an inner polystyrene tray with a ‘cut-out’ for robust protection of the thermometer. The thermometer packaging is then used to return the calibrated instrument to the customer, together with the calibration certificate.
  • Two sizes of packaging are available with the following product numbers:

-- Thermometer Length under 305mm – 40/900/0

-- Thermometer Length over 305mm to 405mm –40/901/0

  • For all other instruments ensure that the instrument is adequately packed with sufficient protection to prevent damage during transit.
  • Please include a copy of the purchase order in the packaging or similar documents, allowing us to identify your instrument.


How long will it take for my instrument to be calibrated?

  • We aim to turn calibration instruments around within 7 business days from receipt, providing we have all the information we require. Exceptions to this are orders where a large number of calibrations are needed.
  • Please contact our sales team for more accurate turnaround times based on the current lab workload.


I have lost my calibration certificate, can you provide a replacement?

  • Yes, all of our calibration certificates are stored electronically and can be retrieved for a small charge should the customer need a replacement. Please contact our sales team for more information on 01946 816600 or Please have the serial number of the instrument and/or certificate number available.