Package Included: 1 x pH Meter (Built-in Batteries), 1 x User Manual, 3 x PH Buffer Powders. Precise measurement: Measuring range: 0.0-14.0PH. Resolution: 0.1 pH; Precision: ± 0.1pH. With LCD display, reliable and fast reading. Auto calibration: PH has an automatic temperature compensation feature that adapts to water temperatures and water quality to give pH readings almost instantly. Widely Applicable: Ideal for home and laboratory applications such as beverages, drinking water, swimming pools, spas, aquarium, hydroponics, etc. Easy to Use: Simply remove the protective cap and immerse the pH meter electrode in the solution. Switch on the pH meter using the ON / OFF switch to be measured. Shake gently until the displayed level is stable and read the displayed levels. Package Contents: 1 x Digital pH Meter ((Built-in Batteries) / p 1 x user manual Measuring range: 0.00-14.00 PH Precision error: ± 0.01 PH Resolution: 0.01 PH Operating temperature: 0 ℃ -80 ℃ Calibration method: automatic 2-point calibration Electrode: glass bulb Temperature compensation: ATC automatic temperature compensation Net weight: 48g Gross Weight: 100g Battery: 2 * 1.5V (LR44 button cell) Dimensions: 155mm * 29mm * 16mm Precautions: Please note that the PH pen probe is a glass product, which is fragile. Please don't hit her with anything. Once damaged, it cannot be replaced. Be sure to protect the probe. Use absorbent paper to gently soak up the water on the probe. . Battery installation: If the backlight brightness drops drastically or the displayed value is fuzzy, the battery should be replaced. When replacing the battery, simply remove the battery compartment to replace it. Pay attention to the polarity of the battery. Note: this does not include other things, the color is based on the first picture and the other pictures only show the effect Due to the differences between different monitors, the picture may not reflect the actual color of the item. Due to manual measurement. Please allow deviation. Thank you!