... pH* LCD indicates both pH & Temp.* Pen type digital pH meter, all in one, pH electrode ... pH 7.00, pH 10.01 buffers*Microcomputer circuit, intelligent function, high accuracy* Easy to change ... DC 1.5 V battery (LR44, BAT ) x 4 PCs* Build in temperature sensor, ATC ... beverage, fish hatcheries, food processing, photography, laboratory, quality control, school & colleges, swimming pools, water conditions* ...