Homdox Portable pH Tester High Accuracy Handheld pH Meter Red with 2xpH Buffer Powders Accuracy:  0.1pH, Range: 0.0 to 14.0pH Handheld design and light weight body makes it easy to take. The meter can be used to test the pH value of your daily drunk water, water in pool and more. The result shows up immediately when the meter is put into the liquids need to test. Each unit comes with a carrying case and small screwdriver for precise calibration.