Supposedly Tympanometry would be safe, yet I and at least one other here recently who experienced it have had our T louder from this. Permanently I hope not. Why, I do not know. But I went in with my T one way, and came out now over 24h later with my eardrum (the actual good side) feeling a little off, and the T tone higher. The ear is also now having contractions with the muscle, or ear drum, I don't know, doing odd 3-4 burst vibration/constrictions inside. Something I never had with that ear.
Their default test of me wasn't necessary before a doctor even saw me, which is why it's upsetting. She identified the problem in the right ear (only reason I even went in) without said test results.
Now I've got either a spike or perm. increase to battle through. I'm skeptical to suggest it was the noise, unless 220hz is somehow a range which causes me a spike, I believe it had to do with the pressure they're creating in the ear through this device which is the cause. What that pressure is doing internally to cause this, I don't know. But something happened to myself and the other user with noise induced T whose T was bad after as well.