An improved device for indicating and measuring small variations in the resistance of a living body is disclosedwhich utilizes a central processing unit to digitally process sensed body resistance and drive a resistance indicating display whilecompensating for the effects of component aging, component tolerance and component temperatures. The device includes an automatic calibration circuit that is automatically activated on each powering up of the device to measure and store measurement valuesfor a plurality of synthesized body resistance that are used to form a compensation model against which sensed body resistance aresubsequently compared for automatic adjustment of display driving measurement values . The central processing unit additionallyadjusts the gain of the meter – driving signal by a gain factor dependent on a user – selected meter sensitivity setting to avoid previouslyexperienced difficulties in monitoring small changes in body resistance caused by difficulty in setting the initially desired meterreading at certain meter- range values, as well as occasional fake and unexpected reversals of meter reading as the meter’s range wasadjusted.
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