Ohio Rev. Code § 4747.15: Exemptions.

The licensing provisions of this chapter do not apply to:

(A) Any person engaged in the practice of measuring human hearing for the purpose of selection of hearing aids provided that such selection does not result in an actual sale of a hearing aid by such person;

(B) Any practicing physician who is licensed by the Ohio state medical board;

(C) Any audiologist who is licensed pursuant to Chapter 4753. of the Revised Code.