Package ContentsElectronic pH meter + 3 packs of calibration powder (pH 4.00, 6.86, pH 9.18), English instruction manual, storage box. Fast and Accurate ReadingsThe pH meter tester has a sensitive electrode sensor for accurate pH reading. ATC FunctionWater quality tester with ATC function, automatic temperature compensation from 0C to 50C, pH measurement from 0.00 to 14.00, +/- 0.01pH high accuracy. Easy to UseTo read the pool pH tester, simply remove the protective cover, turn on the switch button and immerse the electrode into the test solution, gently stir the solution and wait 30 seconds for the reading to be taken. Versatile UseThe hydroponics pH meter is ideal for testing drinking water, swimming pools, aquariums, spas and hydroponics. If you have any questions, please feel free to contact us. Description: Measuring range: 0.00-14.00pH Resolution: 0.01pH Accuracy: 0.01pH Temperature compensation: 0-50C Specifications: Product name: swimming pool pH meter Size: 15.5 x 3 cm Color: yellow Battery: 2 * LR44 internal button battery - Quantity: 1 piece - Application: drinking water, aquarium, hydroponics, swimming pool, spa, hot tub Package includes: 1 * PH meter 3 * PH calibration powder (4.0; 6.86; 9.18) 1 * English user manual 1 * Storage box Note -1. Please rinse and dry the tester probe after each use of the electronic aquarium pH meter. -2. This digital pH meter can only test water from 0 to 50C, otherwise the glass electrode will burst. -3. This electronic pool pH tester is not recommended for strongly acidic and alkaline liquids with an acidity below 2 or an alkalinity above 13. -4. The water pH tester pen should be calibrated for very frequent use or not for long periods of time. -5. The LCD screen of the water quality tester is not backlit.