Calibration, adjustment and verification – these terms often come up in the world of measurement technology. But what exactly do they mean? Many people use them interchangeably, but they actually describe completely different processes. In this article, we explain the meaning of each term and when each is relevant.
What is calibration?
Calibration is the process of determining the deviation of a measuring device from a known reference value – without making any changes to the device itself. The result is called the calibration deviation, which is documented but not corrected.
Example: You place a 100g test weight on a laboratory balance. If it shows 100.02g, there is a deviation of +0.02g. This is noted but not adjusted.
What is adjustment?
Adjustment means actively intervening with the device to minimize or eliminate the measurement deviation. This can be done manually, for example with adjustment screws, or automatically via internal software functions.
Important: Every adjustment should be followed by calibration to verify and document the change.
What is verification?
Verification is a legally regulated process that applies only to certain measuring instruments, such as scales used in trade. A government-authorized body checks whether the device measures within legally permissible tolerances.
If the device passes the test, it receives a verification seal. In many countries, verification is required by national law, such as Germany’s Measurement and Verification Ordinance (MessEV).
Summary:
- Calibration: Comparing with a reference value – no intervention
- Adjustment: Actively correcting the measurement
- Verification: Legal inspection by an official authority
Conclusion:
Calibration, adjustment and verification are not synonyms – they’re distinct processes with specific purposes. If you work in a lab, industrial setting or retail trade, understanding these differences is essential. They impact not only your measurement accuracy, but also your compliance with legal standards.
👉 Our tip: Calibrate your measuring devices regularly and keep records – it’s the best way to stay compliant and ensure reliable results!