The 270+ model audiometer is a diagnostic audiometer product of Amplivox from England. It is a 2-Channel advanced audiometer that can test air conduction and bone conduction tests, as well as speech test. There is masking function, where noise is emitted into one ear while the other ear is being measured to prevent cross-head noise. There are also special tests for diagnosis, such as a hearing test by a special method to isolate the location of the lesion (Bekesy Audiomety), examine the auditory sound of the auditory nerve endings in the inner ear (SISI test), examine the auditory sound of the auditory nerve and brain fatigue (Tone decay test), etc., The 270+ model audiometer can use the machine as standalone or work with a PC as well.

VDO link: https://www.youtube.com/watch?v=4gvFccSLZtQ