Jellas Pocket Size pH Meter Digital Water Quality Tester for Household Drinking Water, Swimming Pools, Aquariums, Hydroponics, pH Measurement for 0-14.0 pH, &Acirc;&plusmn; 0.1 Accuracy, 0.1 Resolution.(Yellow) WIDE USE, its great for home and laboratory uses; water, pools, aquariums, spas, hydroponics, food, wine and beer making and more. FAST AND RELIABLE READING, Highly accurate for measuring range of 0-14 PH, 0.1 PH resolution, measure & display pH result simultaneously with LCD display, reliable and quick reading. EASE OF USE, you just remove the protective cap and immerse the PH meter electrode in the solution and turn on the PH by ON / OFF switch to be measured. Beats the heck out of trying to see the colors of a litmus strip. POCKET SIZE: its only 1.76 oz with size of 5.94*1.22*0.79 inches, it also comes with a carry case for you easily to carry or store. PACKAGE CONTENTS: 1  pH Meter , 1  Carrying case, 1  Calibration screwdriver, 2  pH buffer powder (for calibration) ,1  User manual.