Air-conduction with 8 frequencies from 250 Hz to 8 kHz Bone-conduction with automatic masking (ST 20 BC) Diagnostic functions (ST 20 SISI) Slim (letter-page size) and lightweight (1,9 kg) instrument Optional handheld loudspeaker for pediatric tests Optional LCD-Display for level and frequency or SISI test score Optional serial PC-interface Optional patient response button with flashing light display
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