pH Meter, Jellas PH-009IV Innovative Folding Digital pH Tester/pH Checker Plus for Water Quality Test, Household Drinking Water, Swimming Pools, Hot Tub, Aquariums, Hydroponics. INNOVATIVE VERSION: The PH-009IV pocket folding pH meter, special attention was given to the ergonomic, it fits comfortably and securely in your hand while the lCD on the side of the handle remains easy to see and read. FAST ACCURATE READING: Without too much efforts to read a guessing reading compared to use a pH litmus strips, Features ATC function, the PH-009IV digital pH tester will provide you a very accurate reading up to TWO decimals within minutes. EASY TO USE AND CALIBRATE: Automatic turn-on the power supply, Just remove the protective cap, drops the meter electrode into solution to be tested and read; Use the provided screwdriver to regulate the meter trimmer until readings match the packets value then finish the calibrate process. WIDE USE: Full measuring range of pH 0 - 14.00, its widely applicable to test almost any liquid pH level in format of water, great for home and laboratory uses, like testing household drinking water, swimming pools, aquariums, spas, hot tub, hydroponics, food, wine and beer making and more. FOLDING POCKET SIZE: The PH-009IV meter can be folded in a dimension of 4.8x1.5x0.6 inches, 1.76oz lightweight, its very convenient for you to carry or store in the handy case. Package Contents: PH-009IV Meter; 2x Buffer Packets; 1x Screwdriver; 1x Carrying Case; 1x User Manual.