Oscilla® USB-300IB is a PC-based diagnostic audiometer much like USB-300B. The audiometer supports 4 automatic hearing tests (20 dB, 20 dB Random, XX dB Random and Hughson Westlake) and includes bone conductor and narrow band masking. Furthermore you can deactivate frequencies, which is useful if you have one or more frequencies that are not tested. Specifications: 11 frequencies: 125 - 8000 Hz -10 dB to 110 dB in steps of 5 dB Bone Conduction and Narrow Band Masking Manual or automatic test Power supply via USB AudioConsole software