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Many observable physiological and biological changes produce a change in impedance which can be easily measured with this compact instrument. High frequency excitation minimizes artifacts from offset voltages present. Built-in balance pot and meter make initial setup a snap.
Internal circuitry separates and supplies both a D.C. and an A.C. (long or short time constant) output. Front panel calibration switch (0.25 Ohms) allows rapid checkout of 2991 operation and recording equipment function. Battery powered (9V) for field use.