CONTROL DYNAMICS PRESENTS A CONDUCTIVITY METER THAT HAS ALL THE FEATURES, WHICH WERE BUILT INTO THE PH METER - HIGH , REPRODUCIBILITY, STABILITY AND A CONTINUOUS DUTY CYCLE. THE MODEL APX 185 LABORATORY CONDUCTIVITY METER INCORPORATES A J FET CONTROLLED OSCILLATOR AD EPROM SWITCHING, WITH AUTOMATIC ABILITY TO CHOOSE 100HZ OPERATION. IT HAS A RELATIVE OF [ LEAST DIGIT OF SELECTED RANGE, REPEATABILITY OF [ LEAST DIGIT AND STABILITY [DRIFT 24 HRS] AFTER WARM UP OF 30 MINUTES OF LESS THAN 1 LEAST DIGIT. SALIENT FEATURES: WIDE MEASUREMENT RANGE FROM 200 NS/CM TO 200 MS/CM [1S = 1 MHO]; HIGH SENSITIVITY - 100 PS/CM USING 0.01 CELL CONSTANT; DIRECT DISPLAY OF CONDUCTANCE - THE DISPLAY IS IN CONDUCTANCE MS/CM AND [S/CM [CONDUCTIVITY X CELL CONSTANT] ELIMINATING CELL CONSTANT DETERMINATION AND USER MULTIPLICATION; AUTOMATIC TEMPERATURE COMPENSATION WITH AN OPTIONAL NTC PROBE, THE CONDUCTIVITY VARIATIONS OF THE SAMPLE WITH TEMPERATURE IS COMPENSATED; RATIOMETRIC MEASUREMENT - USING TWO CONDUCTIVITY CELLS THE INSTRUMENTS CAN BE USED AS A CONDUCTIVITY COMPARATOR FOR QUALITY CONTROL "GO-NO GO" TESTS; AUTOMATIC SELECTION OF OPTIMUM FREQUENCY - THE INSTRUMENT AUTOMATICALLY CHOOSES THE INTERNAL FREQUENCY OF 100 HZ OR 1000 HZ TO SUIT THE MEASUREMENT RANGE FOR VERY HIGH ACCURACY READINGS; AND DIGITAL READOUT - BRIGHT 3-1/2 DIGIT 7-SEGMENT LED DISPLAY FOR EASE OF OBSERVATION OF READINGS FROM 0.0001 [S/CM TO 19.99 MS/CM.