Frye FONIX 7000 - Manual (Page 17)

Introduction and Setup
9
Open Ear Coupler
Non-standard coupler used for realistic
testing of open ear hearing aids.
#5 battery pill
Provides battery current measurements
for many CIC hearing aids.
Also available:
#41 battery pill
AA
Sound Level Calibrator A portable,
self-contained, field-type calibrator for
calibrating the microphone amplifier.
It operates on one nine-volt transistor
battery. Use with 14 mm-to-1" adapter.
Calibration is traceable to the U.S.
National Institute of Standards and
Technology. Conforms to ANSI @1.40-
1984 and IEC 942: 1988.