DanplexScreening audiometer - Metal

Vintage Danplex screening audiometer from the company Acousticon Elmex, a classic device used to measure someone's hearing. It measures: hearing separately left and right, namely the minimum audible sound level per frequency (standard hearing test). All functions of the device have been tested and work.
The set in the case contains:
- The control unit with push buttons and frequencies (250-8000 Hz) and sound level (0-70 dB) and a corresponding headset with distinctive blue and red caps. The red and blue colors refer to the right and left ear.
- A connected button, on which the tested person can indicate what minimum level per frequency he hears.
- A set of response cards.
NB: The sturdy case can no longer be locked with keys and can be opened by pressing with the palm near the keyholes.