Oyunngs Accurate Pocket-Sized Hydrogen Test Pen, High-Definition PH Measurement Probe, Compact Swimming Pools Hydroponics Aquarium for Water Sources(ph Test Pen)

Feature:1. High-definition display, equipped with LCD screen, the reading display is very clear, delicate effect, no graininess. 2. High-quality electrodes, fast measurement response and accurate measurement. 3. Adopt titanium alloy probe to measure the water with high precision, free from the influence of magnetic interference in the water, ensures the measured value is more accurate. 4. Compact and pocket-sized design, easy to carry and use. 5. Apply in water sources, aquarium, hydroponics, spas, swimming pools and other water systems. Spec: Condition: 100% brand new Item type: PH Test Pen Material: plastic Color: As picture shown Weight: Approx. 98g  Battery name: cell battery x 4Battery capacity: 160mahBattery model: LR44Measuring range: 0.0 ~ 14.0phResolution: 0.1PHAccuracy: ± 0.1ph (@ 20 ?) /±0.2phWorking environment: 0 ~ 50 ? RH ? 95%Calibration: one-point calibration PH calibration: 1. Insert the electrode into a mixed phosphate standard buffer solution with a pH value of 6.86 (25 ° C), and gently shake it a few times until the indicated value is stable.2. Adjust the calibration potentiometer with a small screwdriver until the displayed value matches the pH value of the standard buffer solution at ambient temperature.3. Cleaning the electrode, and absorb the water absorbed on the electrode with filter paper.4. Insert the electrode into ph4.01 potassium hydrogen phthalate or ph9.18 borax standard buffer solution. The displayed value should be within the allowable range of error compared with the pH value of the buffer solution. Package List:1 xPH Test Pen 1 x Instruction 1 x Accessory