The Ambco 1000 + Oto Screen Audiometer is a great Audiometer for the School Nurse, Occupational Practice or Physician's OfficeAmbco 1000 + Oto Screen Audiometer Features Save Money Now! Unique audiometer advances pure tone air conduction threshold and screening tests for hearing.The Ambco Model 1000 + Oto Screen is a standard threshold & screening audiometer with the option of sequential testing.Sequential screening eliminating fatigue factor.OTO-SCREEN is microprocessor controlled resulting in accurate, consistent hearing tests.Hands-off screening gives the operator complete control of testing procedure.Ambco 1000 + Oto Screen Audiometer SPECIFICATIONS Meets or exceeds ANSI 3:6 - 1996. ANSI 3.21 1978 (R 1997) Methods for pure-tone threshold audiometryO.S.H.A. C.H.D.P. and other requirementsStandard Mode - dB (Threshold Level) 0 to 90dB in 5dB stepsFrequency Range: 250, 500, 1000, 2000, 3000, 4000, 6000, 8000 Hz.OTO-SCREEN Mode - dB (Threshold Level) 10 to 35dB in 5dB stepsFrequencies presented sequentially: 1000, 2000, 3000, 4000 HzEasy to read displays, quiet soft membrane switches to facilitate testingPortable package with padded bag, weighs 5 lbs.