... pH* LCD indicates both pH & Temp.* Pen type digital pH meter, all in one, pH electrode is included, easy ... 86, pH 9.18 buffers*Microcomputer circuit, intelligent function, high accuracy* Easy to change the pH electrode* Compact size ... as aquarium, beverage, fish hatcheries, food processing, photography, laboratory, quality control, school & colleges, swimming pools, water conditions* Auto calibration ...