4 0 c m
33cm
actual image size: 25cm x 32cm
Description
Doctors use these devices to test hearing using 'extremely quiet' ear sounds. For example, this can be used to test the hearing of new-born babies, months before traditional tests are posible. This is because the equipment is digital, portable, reliable and inexpensive.
Image Details
Image Ref.
10328793
© Science Museum / Science & Society Picture Library