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  • Testers designed to assess the characteristics of hearing aids; they can usually measure, evaluate, display, and/or record hearing-aid characteristics, such as insertion gain, sound pressure level, frequency response, and harmonic distortion either as graphs or as numbers. Many testers use composite signals instead of pure frequency tones for testing, thus improving testing of nonlinear hearing aids and making detection of intermodulation distortion easier. These testers typically include signal generators, audio transducers (e.g., microphones, loudspeakers), a display, and computing and recording capabilities. Hearing-aid testers are used to fit and periodically test analog, digital, and/or programmable hearing aids; most testers include capabilities for both test chamber and real ear measurements.
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