7. Suitability U.K.
7.1.A measuring instrument shall have no feature likely to facilitate fraudulent use, whereas possibilities for unintentional misuse shall be minimal.U.K.
7.2.A measuring instrument shall be suitable for its intended use taking account of the practical working conditions and shall not require unreasonable demands of the user in order to obtain a correct measurement result.U.K.
7.3.The errors of a utility measuring instrument at flows or currents outside the controlled range shall not be unduly biased.U.K.
7.4.Where a measuring instrument is designed for the measurement of values of the measurand that are constant over time, the measuring instrument shall be insensitive to small fluctuations of the value of the measurand, or shall take appropriate action.U.K.
7.5.A measuring instrument shall be robust and its materials of construction shall be suitable for the conditions in which it is intended to be used.U.K.
7.6.A measuring instrument shall be designed so as to allow the control of the measuring tasks after the instrument has been placed on the market and put into use. If necessary, special equipment or software for this control shall be part of the instrument. The test procedure shall be described in the operation manual.U.K.
When a measuring instrument has associated software which provides other functions besides the measuring function, the software that is critical for the metrological characteristics shall be identifiable and shall not be inadmissibly influenced by the associated software.