Ambco Model 1122 Portable Audiometer.
Hand activated Right and Left Ear switches. Contained in fold-up, light weight carry case. Frequency range: 250, 500, 1000, 2000, 3000, 4000, 6000, 8000 Hz. Threshold range: 0 to 80dB. Tested to produce sounds at all frequency, however, has not been recently calibrated. We do not warranty or refurbish medical equipment. No manual or peripherals included.