1. For the categories of instruments with which they are concerned, separate directives will specify the measurement characteristics of and the technical requirements for their design and functioning. ... The inspection carried out in the EEC initial verification relates in particular, in accordance with the relevant separate directive, to: - the measurement characteristics; - the maximum permissible errors; - the construction, in so far as this guarantees that the measurement characteristics are not likely to deteriorate to any great extent under normal conditions of use. ... Examination for EEC approval. The examination shall comprise: Study of the documents and an examination of the measurement characteristics of the pattern in the laboratories of the metrological service, in approved laboratories or at the place of manufacture, delivery or installation. If the measurement characteristics of the pattern are known in detail, only an examination of the documents submitted. The examination shall cover the entire performance of the instrument under normal conditions of use. Under such conditions, this instrument must maintain the measurement characteristics required.
2. The sealing marks, the calibration certificates and the calibration tables cease to be valid ... or as soon as the tank has become deformed, or been repaired or reconstructed, in a way liable to alter its measurement characteristics.
