We are offering portable digital audiometer features and specifications built using completely new dsp technology 1> completely click less interrupt. 2> +20db key. 3> masking: - wide, narrow & speech band noise. 4> tone decay test. 5> pulse tone function. 6> bone conduction:- 250hz(50db), 500hz(70db), 750hz(70db), 1khz(70db), 1.5khz(70db), 2khz(70db), 3khz(70db), 4khz(70db), 6khz(70db). 7> air conduction:- 250hz(90db), 500hz(120db), 750hz(120db), 1khz(120db), 1.5khz(120db), 2khz(120db), 3khz(120db), 4khz(120db), 6khz(100db), 8khz(100db). 8> provided with bone vibrator and hd-01 headphones. (tdh-49 optional) 9> complete digital calibration. 10> can be connected to a computer via usb and operated as a pc based audiometer. 11> pc software provided free of cost in standard packing. 12> small form factor. 13> award winning design. (cypress design contest 2002, u.s.a.) 14> possible to connect to free-field amplifier via separate junction box.