Abstract: A method for fitting a hearing instrument comprises placing the hearing instrument in situ includes receiving an audiogram of the user, determining a target gain for the hearing instrument as a function of the audiogram, exposing a reference sensor located adjacent the hearing instrument to an external speech signal, measuring an external sound pressure level (SPL) via the reference sensor, exposing a probe sensor coupled to the inside of the ear to the output of the hearing instrument while the hearing instrument is in situ, measuring an internal sound pressure level (“SPL”) inside the ear of the user via the probe sensor, determining an offset gain as a function of the external SPL, the target gain and the internal SPL, and automatically adjusting a gain of the hearing instrument according to the offset gain.

Abstract: A threaded insert installation tool includes an adapter assembly that connects a front and assembly with a driver. The threaded insert installation tool may be used in areas with limited access and may be operated with a battery-powered screwdriver. The adapter assembly may include a drive shaft that may have a segment square cross-section that may slide in linear direction within a square-hole sleeve assisted by a spring converting the rotary motion provided by the cordless screwdriver into a linear feed. The threaded insert installation tool may be suitable for, but not limited too, applications in the automotive, communication, aerospace, military and defense industries. The threaded insert installation tool may be used to install threaded inserts in tapped holes that are positioned in a space having an extended depth and a close proximity to surrounding walls, such as inside a cylinder or a barrel, for example, a missile shell.