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Item 01345 AMBCO Model 650 Pure Tone Audiometer Portable and lightweight. Custom carry bag included. Easy to use tone switch. Tone present indicator. Steady and pulsed tone. Extremely accurate. Plug-in 110 or 220 volt battery life indicator. Patient response. Meets or exceeds ANSI S3.6 1989, ASA 81-1989, ISO 389-1985, C.H.D.P, O.S.H.A, E.P.S.D.T. F.A.A., Police, and Divers requirements. Frequency Range: 250, 500, 1000, 2000, 3000, 4000, 6000, 8000 Hz accuracy better than ± 3%, (steady and pulsed tone). Hearing Threshold Range: 0 to 90dB in 5dB steps, accuracy better than ± 2 dB. Harmonic Distortion - less than 3%. 110-230 VAC, 50-60 HZ UL, C.S.A. approved power supply. Total weight less than 4.5 Ibs (complete with headset, TDH 39 earphones, patient response, audiogram pad, and carrying bag.) Pre-owned.