The Audiometer is a precision instrument designed to permit simple, rapid and reliable hearing tests. Applications range from school testing programs to pre-employment examinations and monitoring audiometry for hearing conservation programs. The instrument provides pure tone frequencies and a full dynamic range. Features include a full range electronic attenuator (-10 dBHL to 110 dBHL mid frequencies), with all input/output switching and routing performed electronically. Large LED numeric displays show the selected frequency and HL intensity. Small individual LEDs are used to show the selected function.