Some folks select the calibration source based on convenience. They reason that the best choice for them is the lab down the street or around the corner because they don’t have to ship their stuff any distance to get it done.
Assuring the quality of a measurement is crucial. In order to achieve the finest measurement and thereby the correct decision based upon it, calibration of equipment both before and after use is essential.
A cost-benefit analysis is a decision-making tool. It is a process of adding up the benefits of doing something or buying something and subtracting the costs to help us decide whether that purchase or action is worthwhile.
A friend in the industry contacted me recently for suggestions on dealing with a request from a customer of their calibration service requesting the results of vision tests on their lab people.