HAND HELD PORTABLE; LCD DISPLAY; 1 TO 5 POINT PH AUTOCLAIBRATION; BUILT-IN RECOGNITION FOR 5 BUFFERS; MANUAL ISE CALIBRATION UP TO 5 POINTS; AUTOBLANK CORRECTION; SELECTABLE RESOLUTION OF 0.1/0.01/0.001 PH; AUTOCALCULATION/DISPLAY OF ELECTRODE SLOPE; ADJUSTABLE ISOPOTENTIAL POINT IN PH; DATE/TIME OF LAST CALIBRATION DISPLAYED; 24 HOUR CLOCK; INTERNAL TIMER; HIGH/LOW ALARM LIMITS; INTERNAL 25 POINT DATALOGGING; 3 PRINT OPTIONS; RS-232-C TRANSFER PORT