An otoscope (left) is a medical device which is used to look into the ears.
An otoscope potentially gives a view of the ear canal and eardrum, allowing doctors to screen for illness and investigate ear symptoms. This model would have been powered by batteries stored in the handle.

A reflex hammer (right) is a medical instrument used by physicians to test reflexes. Testing for reflexes is an important part of the neurological physical examination (to determine whether the nervous system is impaired).

A reflex action, also known as a reflex, is an involuntary and nearly instantaneous movement in response to a stimulus (in this case a blow from a reflex hammer).