Difference Between Non-Accredited & Accredited Calibrations


Most customers in need of calibration services are unaware of the options they have. Usually, equipment goes to the calibration lab, but customers don’t indicate the end use of the equipment. All they want is calibration. 

The next time you need your equipment calibrated, keep the different calibration types in mind. Having enough calibration knowledge means you get the right services. In addition, the certificates you receive will contain accurate information. 

So, what are the differences between non-accredited and accredited calibrations? Here’s all you need to know:

Non-accredited Calibrations

These calibrations are performed in-house. Non-accredited calibrations are also known as:

  • Commercial calibration 
  • Standard calibration 
  • NIST traceable calibration 

If you use calibration services often, you are familiar with non-accredited calibrations. Technicians follow specific procedures according to calibration lab guidelines. However, you still get a certificate with basic equipment information such as model and serial number, manufacturer, and calibration date. 

In addition, the certificate indicates the next calibration dates, the conditions during calibration, and a pass or fail based on tolerance. 

Accredited Calibration

The major difference between accredited and non-accredited calibrations is the additional requirements for accredited calibration. These specific requirements should conform to international standards (ISO/IEC 17025). They include:

  • Accreditation logo 
  • Measurement data 
  • Uncertainty values

The accredited calibration process needs technicians to stick to calibration procedures. Moreover, meeting the standards listed in the Scope of Accreditation is crucial. These standards are the most accurate in NABL accredited calibration labs. Accredited calibration is mandatory when product quality, accuracy, safety, and health are important. 

Accredited Calibration Labs

Calibration labs can perform non-accredited calibrations. However, accredited calibrations must occur in labs with ISO accreditation. For a laboratory to get the necessary approval, it must observe measurement capabilities within the lab. Proficiency testing includes verifying uncertainty values and comparing them with other accredited laboratories.

Companies and industries dealing with time-critical instruments can use mobile calibration services. The advantage of mobile calibration units is minimised downtime. So, you get technicians to come to your facility to perform calibrations. 

Mobile calibration units are an excellent solution for multi-site organisations with several measuring equipment that cannot leave the site. 

How to Decide the Type of Calibration to Choose 

Organisations differ, and it is up to customers to specify the type of calibration they need. However, if you’re a first-timer and don’t know what route to take, the equipment’s use is a good guideline. Moreover, consider if any regulatory requirements determine calibration levels. Some industries also have specific calibration requirements for their equipment.  

Non-accredited calibration should be your go-to if you work in a low-risk environment. Such environments have large specifications and follow a pass or fail criterion. On the flip side, if your equipment is used in critical applications, stick to accredited calibration. 

All accredited laboratories have the Scope of Accreditation document showing the parameters, range of measurements, and uncertainty values. So, you don’t have to memorise the equipment’s technical parameters. 

Many companies offer non-accredited and accredited calibration services. If you need your equipment calibrated in NABL accredited calibration labsvisit certified facilities with your equipment and give all your requirements. 


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