"WATERPROOF METER; ON-THE-SPOT MEASUREMENTS; .01PH RESOLUTION AND ACCURACY; MEMORY STORES AND RECALLS 15 READINGS; LARGE 3 1/2 DIGIT DIGITAL DISPLAY WITH BARGRAPH; DATA HOLD; AUTO SHUT-OFF AND LOW BATTERY INDICATION; EASY TO REPLACE ELECTRODE MODULES, AND BUILT IN CHIP; DIMENSIONS: 1.4 BY 6.8 BY 1.6 INCHES; WEIGHT: 3.8OZ; PEN-SHAPE"