scope:

This standard is applicable to symbols and other markings on hearing aids and related equipment for the purpose of identifying control settings and giving information regarding technical functions and characteristics. Related equipment shall be understood to include devices such as: - hearing aid equipment, not entirely worn on the listener; - auditory trainers; - group hearing aid equipment -insert earphones; - other accessories. The object of this standard is to provide symbols and markings for the benefit of users and those involved in the fitting of hearing aids and related equipment. This standard defines markings for gain controls, output controls, switches, selectors, pre-controls, characteristics of earphones and polarity of batteries. In certain cases some funtions may be combined in one switch, for example the battery switch may be combined with the tone selector, with the input selector or with the gain control.