При отсутствии необходимости в проведении метрологической экспертизы Заказчику представляется соответствующее заключение за подписью Главного инженера проекта.
If there is no need for a metrological examination of the customer appears to be an opinion to that effect signed by the Chief Engineer of the project.
If there is no need for carrying out metrological examination of the customer it seems appropriate conclusion signed by the Chief Engineer of the project.