Ergonomic panel design and convenient controls allow one-handed operation of this easily portable audiometer. Frequency values and HL levels are easily visible at a glance. The AM 232 also offers selection modes for steady, pulsed or frequency-modulated stimulus for increased reliability of response. +10 dB push-button prevents mistaken presentation of uncomfortable frequency tones. Provides ample storage space inside hard-shell case for standard headphones and optional accessories.