Some countries have introduced electronic devices called audiometers. His machine became the basis of the audiometers later manufactured at Western Electric. Screening PC-based audiometers use a standard computer. The TEN test has been incorporated in the audiometers of several major manufacturers. Medical grade audiometers are usually an embedded hardware unit controlled from a PC. An alternative to hardware audiometers are software audiometers, which are available in many different configurations. These audiometers are also used to conduct industrial audiometric testing. Audiometers are standard equipment at ENT (ear, nose, throat) clinics and in audiology centers.