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0.0-14.0 High Accuracy Digital Ph Meter with ATC Hydroponic Water Quality Testing Equipment Portable Pocket Handheld Pen Type PH Meter to Measure Liquid, Purity, Acidity, Alkalinity for RO Water Purifier, Aquarium, Swimming Pool Water, Fishing, Laboratory, Food, Beverage, Soil with Buffer Powder Calibration Solution + Automatic Temperature Compensation + Care Box Soil Test Kit