reg 44 General requirements to be met by technical documentation
(1) The technical documentation must— (a) render the design, manufacture and operation of the regulated measuring instrument intelligible; and (b) permit an assessment of its conformity with the applicable requirements of these Regulations . (2) The technical documentation must be sufficiently detailed to ensure compliance with the following requirements— (a) the definition of the metrological characteristics; (b) the reproducibility of the metrological performances of produced regulated measuring instruments when properly adjusted using appropriate intended means; and (c) the integrity of the regulated measuring instrument.