Clause 1 of ISO 18190:2016 applies. In addition: This International, device specific, Standard specifies requirements for laryngoscopes with non flexible BLADES and HANDLES, with internal battery operated power sources, used for illuminating the larynx during intubation. It also specifies critical dimensions for those HANDLES and BLADES with interchangeable HOOK ON FITTINGS. It is not applicable to: - flexible laryngoscopes; - laryngoscopes designed for surgery; - laryngoscopes powered from mains electricity supply; - laryngoscopes connected by light transmitting cables to external light sources; or - video laryngoscopes designed to work with an external, integral or attached video system.