Describe the evidence you need
Calibration relates the instrument’s indications to reference values and accounts for measurement uncertainty. Adjustment changes the instrument’s response. Verification checks whether a stated requirement has been met. For a pass or fail decision, give the requirement and agree how uncertainty will enter that decision.
Decide what should happen to a borderline result
A buyer might request calibration of a controller and ask that any offset be corrected. If the laboratory adjusts it before recording the initial comparison, the plant loses the best evidence of how it behaved in service. Ask for the initial results at defined points, identify who can approve work and state whether another comparison is required after adjustment.
If the only immediate question is whether a reference check meets a particular limit, send the limit and the decision rule used by the owner. The quotation can then state what measurement is made and whether it includes a statement of conformity.
An example order for a torque wrench
An assembly team could ask for as-found results at its working settings and authorise adjustment only after it sees those results. If the results satisfy the agreed rule, the team may accept the wrench as received. After an authorised adjustment, request a separate set of readings and keep both sets against the same serial number.
For a wrench shared between stations in IMT Manesar, identify who can release it and who can approve adjustment. If approval comes from another state, include that contact on the request.