When it comes to in-the-field calibration of video measuring systems and other high-end measuring equipment, companies I talk to often do not realize or understand the difference between verification and calibration. Most of the time, companies look to save money on the maintenance cost of video and optical equipment. They have sticker shock when they call the manufacturer for an annual calibration price. This is when they start shopping around and find a local company that says, "Sure, we can calibrate that for you!" The company comes in, measures its reference standards with the equipment needing calibrating, and issues a calibration certificate, not knowing the manufacturer’s specifications under which the equipment was sold to the customer or the maintenance checks required. Furthermore, some of these companies tell customers they have ISO-17025 accreditation, which is probably true. However, the customer fails to check to see if their equipment is on the calibration company’s scope of accreditation, a significant oversite. If the equipment needing calibration is not on the calibration company’s ISO-17025 scope of accreditation, they do not have ISO-17025 to calibrate or verify that equipment.
A quick Google search of verification versus calibration comes back with the following AI overview: