This part of ISO 10109 is applicable to optical instruments and instruments with optical components. It specifies the requirements to be met with regard to the reliability of the optical, mechanical, chemical and electrical properties or performance characteristics (see Note) of the instruments when exposed to environmental influences. Hence it also determines geographical and technical areas of application. Environmental test methods, as specified in ISO 9022 (all parts), are assigned to the various areas of application for the purpose of ascertaining the suitability of the instruments in the respective area of application. This part of ISO 10109 does not deal with the requirements to be met by the packaging of the instruments during transport from the manufacturer to the user. NOTE For the purposes of this part of ISO 10109, nominal values for properties or performance characteristics are understood to be the technical data provided by the manufacturer, technical conditions of delivery or instrument standard.