SunsbellDigital Pocket PH Water Meter Tester For Aquarium Pool Fish Spa Wine Hydroponics Test To Help Balance Your Health today Measuring PH Range: 0.0 - 14.0 pH Widely used for Aquarium water , drinking water, tank water, swimming pool water,municipal water supply, Travel health care and so on. If you need two or more than two, we can give you a 5% off sale price, please contact us after your purchase. This digital pen style pH meter is an ideal instrument for aquarium, fishing industry, swimming pool, school laboratory, food & beverage etc. Package:1 x Digital PH meter;1 x Calibration Adjustment screwdriver;2 x Pouches of calibration buffer solution ;3 x AG13 Button Cell Batteries (installed);1 x User instruction;1 x Plastic Case