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Bseen pocket size digital PH meter uses advanced technology and imported components, great for human body, drinking water, fish tank, soil ph test. Specifications: • Size: 5.5 x 1.14 x 0.6 inches • Weight: 1.08 oz • Measuring Range: 0-14.0 PH • Resolution: 0.1 PH • Accuracy: ±0.1 ph (20 degree) • Working temperature: 0-50 degree • Battery: 3 x 1.5V AG13 button cell (included) How to calibrate: 1.Use the calibration powder preparing a standard buffer solution. 2.Immerse the electrode in the standard buffer solution under the temperature of 25 degree and wait for 1 minute. 3.Regulate the trimmer with a screwdriver until the reading corresponding to standard buffer solution PH 4.01 or 6.86. Tips: It is normal phenomenon that the PH meter will be kept beating in air, and the data will be stable after being in the liquid. Package Included: • 1 x PH Meter • 1 x Carrying Box • 1 x Calibration Screwdriver • 2 x PH Butter powder( for calibration) • 1 x User Manual Warranty: We guarantee that we will give you 100% satisfaction and comfortable after-sales service If any problem, please feel free to contact us, we will try our best to solve any problems.