Ohio Rev. Code § 2923.25: Gun locking devices.

Each federally licensed firearms dealer who sells any firearm, at the time of the sale of the firearm, shall offer for sale to the purchaser of the firearm a trigger lock, gun lock, or gun locking device that is appropriate for that firearm. Each federally licensed firearms dealer shall post in a conspicuous location in the dealer's place of business the poster furnished to the dealer pursuant to section 5502.63 of the Revised Code and shall make available to all purchasers of firearms from the dealer the brochure furnished to the dealer pursuant to that section.

As used in this section, "federally licensed firearms dealer" has the same meaning as in section 5502.63 of the Revised Code.