Hearing aids with microphone and telephone coil are to be made simpler and more convenient. The analytical tool pack includes a stopper portion for holding the analytical tool with the analytical tool caused to project from the sealing sheets. The via is filled with conductive material. The adapter has a bottom wall and a side wall forming a well and an outwardly extending top wall at a top end of the side wall. The invention also provides compositions including the inventive end-modified polymers, methods of preparing the inventive polymers, and method of using the inventive polymers.