TW/CONTROL UNIT AND ELECTROCHEMICAL CELL W/STANDARD SOLID ELECTRODES; PRINCIPLE - THREE ELECTRODE SYSTEM; OXIDATION AND REDUCTION CAPABILITY; 10 V MAX. OUTPUT; 50 MICROSECOND RISE TIME; CONTINUOUSLY ADJUSTABLE BETWEEN 1 TO 3000 V WITH A RESOLUTION OF 1 MV APPLIED POTENTIAL; 0.1 NA TO 5000 NA FULL SCALE IN 14 STEPS DETECTION RANGE; 10 TO THE -3 POWER NA NOISE; 1 MV/DAY DRIFT; 10 MV OR 1 V RECORDER OUTPUT; 100 PSI PRESSURE LIMIT; TEFZEL BODY; TEFLON GASKET; TEFLON ELECTRODE HOLDERS