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The constant current generator 61 is controlled by the remote controller microcomputer 12 for feeding a pair of current electrodes 7a and 7b with a small constant current tonalin at a high frequency of 50 kHz. The differential amplifier circuit 62 is provided for amplification of a difference between the voltage amplitude at the measurement electrode 7c and the voltage amplitude at the measurement electrode 7d. When the impedance across the body is high, the measurement current running through the tonalin body will be low hence increasing a difference between tonalin the voltage amplitude at the measurement electrode 7c and the voltage amplitude at the measurement electrode 7d and allowing the differential amplifier circuit 62 to release an output wave of large amplitude. In reverse, when the impedance is low, the amplitude of an output wave from the differential amplifier circuit 62 will be small.
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