It would be acceptable to state in the certificate only the largest value of expanded uncertainty for all the reported errors: U(E) = 9,4 g, based on k = 2,1 for = eff υ 26, accompanied by the statement that the coverage probability is at least 95 %.
The certificate may give the advice to the user that the standard uncertainty to the error of any reading R , obtained after the calibration, is increased by the standard uncertainty of the reading u(R) depending on the scale interval: