Yes. Ohio's licensing law exempts owners testing their own home, and Ohio homeowners can order a free kit through ohio.radon.com or buy one for $15 to $30. For a home sale, use an Ohio-licensed radon tester instead.
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A kit gives a sound screening number when it is used the way Ohio's measurement protocol describes. Close the house for at least 12 hours before starting and keep it closed during the test, apart from normal coming and going. Set the device in the lowest level that is lived in, 20 inches to 6 feet off the floor, at least a foot from exterior walls, 3 feet from doors, windows, and vents, 4 feet from heat sources, and 10 feet from the sump, and never in a kitchen, bathroom, laundry room, or closet. Skip stormy or very windy stretches. Mail it as soon as the kit instructions say. A sale test is a different animal: 48 hours minimum, side-by-side devices or a continuous monitor, a signed noninterference agreement, and a licensed tester. See the testing service.