Feature 1、Equipped with an LCD display, which can visually display the PH measurement results. 2、The pH measurement range is 0.0‑14.00pH, with high accuracy and small error. 3、Suitable for aquarium, fisheries, swimming pools, school laboratories, food and beverages, etc. 4、Small and portable, it can be used to check water quality, with sensitive response and convenient operation. 5、With calibration solution, please calibrate with solution before use to make sure accurate measurement. Condition: Item Type: PH Tester Material: PVC Measuring PH Range: 0.0-14.00pH Resolution: 0.1pH Accuracy: ±0.01pH Temperature Compensation: 0℃-50℃ Working Temperature: 0℃-50℃ Battery: 4 x 1.5V LR44 Button Battery (Battery Not Included) Weight: Approx. 135g / 4.8oz Operation Steps: Step 1. Remove the protective cover. Step 2. First clean the electrode with distilled water, and then absorb the electrode with filter paper. Step 3. Turn on the PH via the "ON-OFF" switch located on the top of the battery box. Step 4. Immerse the pH meter electrode in the solution until it is immersed in the liquid level. If there is no immersion liquid, immerse above the display liquid level. Step 5. Stir gently and wait for the reading to stabilize. Step 6. After use, turn off the PH, clean the electrode with distilled water and cover the protective cap. Package List 1 x PH Tester (Battery Not Included) 2 x Calibration Solution (4.01 and 6.86) 1 x Chinese Manual 1 x Screwdriver Note 1.Please allow 0‑1 inch error due to manual measurement. Thanks for your understanding. 2.Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. 3.Please calibrate with solution before use. 4.Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ording.