to the present invention therefore provides for eliminating the drawbacks typically associated with known systems the device described in fact provides for simultaneously measuring two adjacent bone portions the distal metaphysis and adjacent proximal diaphysis portion differing widely as to anatomical structure despite forming part of the same bone portion waveforms fo 1 and fo 2 also provide for discriminating between the two portions to obtain separate information relative to the distal metaphysis and the proximal diaphysis portion device 1 in fact provides for displaying and processing two different waveforms u2014 fo 1 and fo 2 u2014 with clearly visible portions i and ii u2032 which may be analyzed and compared even only visually to obtain various information concerning the characteristics of the distal metaphysis and the proximal diaphysis portion the automatic operations performed in blocks 200 210 220 also provide for determining correct positioning of transducers 16 17 and correct performance of the measurements as well as for repeating any unconfirmed measurements automatically defining windows enclosing characteristic portions of the waveform enables signal analysis algorithms block 230 to be applied to characteristic waveform portions to obtain data accurately representing the condition of the bone tissue and the operations in blocks 300 330 assist in accurately defining the windows clearly changes may be made to the device as described and illustrated herein without however departing from the scope of the present invention the device 1 a shown in fig7 differs from the fig1 device by the output of first ultrasonic receiver 22 communicating directly with the input of a signal amplifier 28 a the output of which communicates with the input of a filter 30 a in particular a.