Sure. The idea is that you want to find out if someone's hearing loss is a question of nerve damage or whether it's conductive--in other words, are the physical sound waves being blocked somewhere along the way.

Air conduction--sound waves traveling through air with nothing in between--should be better than bone conduction, where the waves travel to the inner ear apparatus through the bones of the skull. You start testing this by striking a tuning fork and placing the tip of it on the mastoid bone--that lump behind your ear. You ask the person to tell you when they don't hear it anymore, and then you move it to just outside the ear, not touching anymore, and ask if they can hear it now. A normal person will be able to hear it again. But so will someone with sensorineural hearing loss, because even though their air conduction sense will be reduced, so will the bone conduction be, so it's relatively preserved as a difference. This is called a positive Rinne test. In someone with purely conductive hearing loss but whose nerves are okay, bone conduction is better than air conduction, so they won't hear anything when you move the tuning fork. That's a negative Rinne.

A Weber test is when you take the tuning fork, strike it, and place the tip of it in the center of the forehead. If a person has a unilateral conductive hearing loss, the sound will be LOUDER in the affected ear. This seems counterintuitive, but basically it sounds louder there because they aren't picking up any outside ambient sound in that ear and their nerve is just fine, so it pays "more" attention to the bone conduction input. So a normal person will hear the sound the same in both ears, and someone with a one-sided conductive hearing loss will have a positive Weber test for the affected ear. If they have equal hearing loss in both ears for whatever reason, this test will be uninformative.

Both the Weber and the Rinne are very rough screening tests. If I'm really worried about someone's hearing, I send them to an audiologist.