Interacoustics AS608 Operation Manual page 20

Press Change to toggle between English, German, Spanish and
French.
LCD Contrast.
Press Change to toggle between settings ranging from 0 (very bright)
to 6 (very dark).
HW Test... (only on AS608e)
Press Change to go to the Hughson Westlake (HW) automatic test
procedure setup.
Press Change to toggle between Familiarization On/Off.
Familiarization is used to train the patient
Press Change to toggle between "2 correct out of 3 answers" and "3
correct out of 5 answers". The conditions used before going to the
next frequency.
AS608/AS608e Operation Manual Page16