Audiometry is an accurate and reliable hearing test. It is usually administered to a person sitting in a soundproof booth wearing a set of headphones which is connected to an audiometer. Small foam insert earphones placed in the ears may also be used. The audiometer produces tones at specific frequencies and set volume levels to each ear independently. The audiologist or licensed hearing aid specialist plots the loudness, in decibels, on an audio-gram. People having their hearing tested will convey that they have heard the tone by either raising a hand or pressing a button.