Family essentials Every Family need water ph meter ,healthy drinking water range from pH 6.5 - ph 8.5,Don't need calibrate in the first time ,our factory already finish calibration ,Pls use it directly Handheld Pocket Size it's easy to carry and check your water quality any time Quality Control In Every Action Water pH Tester with LCD Display for Gardening Hydroponic Nutrient Meter,Household Drinking Water,fish tank,RO System,Swimming Pool & Spa,pond,kombucha,wine,Aquarium Water,Comes with Carrying case Advantage About PH Pen Tester Simple Operation,LCD Screen,High Precision,Non-Slip Design,One-Click Operation,Small and Convenient,0.01 High Accuracy,Pocket Size Meter/PH 0-16.0 Measuring Range Food PH Meter for Healthy Life Modern man often pays insufficient attention to the water he drinks,in fact most dieases occur due to the use of water of doubtful quality Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.