Lauri, I appreciate your enthusiasm in answering every post, but you're giving some incredibly strange advice. It's impossible to completely rule out mites, no matter what special tools you use. Have you heard the phrase "false negative" or "false positive"? It is incredibly easy to generate "false negatives" while looking for parasites because it relies on the vet being lucky enough to scrape an area where there are parasites.
Any knowledgeable vet will tell you the same thing.
We are as gods to the beasts of the fields. We order the time o' their birth and the time o' their death. Between times, we ha' a duty. - Terry Pratchett.
"Men have forgotten this truth", said the fox, "But you must not forget it. You become responsible, forever, for what you have tamed. - Antoine de Saint-Exupéry