5:23 Starkey Hearing Foundation in Rwanda and Uganda with the NFL Philip Marshall 3.1K views - 14 years ago
2:40 Tympanometry -- the theory of measuring middle ear function Philip Marshall 7.6K views - 15 years ago
2:53 Looking after your hearing aids -- tips to securing optimum performance Philip Marshall 398 views - 15 years ago
7:20 All you ever wanted to know about hearing aid batteries Philip Marshall 449 views - 15 years ago
4:05 How we determine the degree and nature of a hearing problem Philip Marshall 2K views - 15 years ago