Ohio Rev. Code § 3506.13: Challengers and witnesses in precincts where marking devices, automatic tabulating equipment, voting machines, or any combination of these are used.

In precincts where marking devices, automatic tabulating equipment, voting machines, or any combination of these are used, observers may be appointed as prescribed in section 3505.21 of the Revised Code. The duties and privileges of observers in such precincts during the hours the polls are open shall be as provided in section 3505.21 of the Revised Code.

Observers shall be allowed to remain in the polling place after the polls close and may observe the processing of the ballots and the sealing and signing of the envelopes or containers or both containing the voted ballots.