Testimääramatus iseloomustab testimisseadme kvaliteeti ja testimist. Testimääramatust kontrollib ja selle eest vastutab testija, kes turustab ja kasutab testimisseadmeid ning kannatab suure testimääramatuse korral vähenenud vastavus- või mittevastavustsooni all.
Test uncertainty is a measure of the quality of the testing equipment and its use in the test. Test uncertainty is controlled by and is the responsibility of the tester, who provides and uses the test equipment and suffers a reduced conformance or non-conformance zone in the case of a large test uncertainty.
