Most people are more comfortable with old problems than with new solutions.
Forget the past, no one becomes successful in the past. We'd love to hear from you. A completely new and easier to use technique has been developed for people who haven't been able to master the standard testing method. Unfortunately, it is a very difficult piece of equipment to learn to use, much less master with any degree of accuracy. Having spent many, many fruitless hours, day after day for weeks trying to produce a resonance tone, I can testify personally to its difficulty.