The EarCheck Middle Ear Monitor takes the worry and guesswork out of knowing if there is fluid in your child's middle ear, a key symptom of ear infection. At the touch of a button, it quickly and accurately indicates the likelihood of fluid and displays the results on an easy-to-read LCD display. You'll know whether to consult the doctor in seconds. This instrument is designed for use in the home by adults on children from 6 months to young adult.