In fact, online dealers have also not been able to live up to the expectations. That’s because there are certain demerits of online purchasing. On that note, before buying hearing aids, you must visit an Audiologist, who will carry out a series of tests to determine the level of hearing loss, and to recommend the most suitable solution (aids) or make a medical referral. It is neither possible to conduct these tests online, nor can you be sure of the quality offered.