[ACCURATE AND WIDELY USED] Ideal for residential or commercial use, drinking, pools, aquariums, liquid food, laboratory, aquaculture and hydroponics, you can test any 0.00-14.00pH liquid which you wanna test and get readings almost instantly. [AUTOMATIC TEMPERATURE COMPENSATION (ATC)] Thanks to built in automatic temperature compensation (ATC), who can accurately determine pH value of the sample at any temperature in a range of 0C - 80C (32F - 176F), you can get the accurate pH value without taking care about the influence of water temperature. [EASY AUTO CALIBRATION] It has an automatic calibration function that can be adjusted according to water temperature and quality. Calibrate the tester with one touch button CAL using Calibration Buffer Powder. [CONVENIENT AND QUICK] Remove the protective cap,immerse the pH tester electrode in the solution,press the button to be measured and you can get readings almost instantly. [PERFECT ACCESSORIES] Come with 1x PH meter, 1x user manual, 2x 1.5V LR44 button cells(build-in), 3x PH Buffer Powders. The enclosed detailed manual will show you how to get the best accurate and stable reading. Specifications: Measure range: 0.00- 16.00pH Resolution: 0.01pH Accuracy: 0.5 pH Power Supply: 2*1.5V (LR44 Button cell) (Included) Operating Temperature: 0C - 80C (32F - 176F) Dimension: 155mm* 31mm * 18mm / 6.101.220.70 Weight: 50g / 1.76oz Features: Automatic Temperature Compensation (ATC) One button (CAL) calibrate Automatic shut-off after 5minutes with inactive Calibration: a. Dissolve pH buffer powder in 250ml of distilled water. b. Turn on pH meter and clean the electrode in distilled water, then immerse the electrode in the pH standard solution. c. Press CAL button, make the reading equal to standard buffer solution pH 6.86, 4.01 or 9.18. d. Clean electrode with distilled water and dry it.