Instrument introduction: The measurement of the pH value of an aqueous solution generally uses a glass electrode as an indicating electrode, and a calomel electrode as a reference electrode. The potential generated between them also changes, and the potential change relationship conforms to the following formula: E58.16pH(273+t)/293mV E: Indicates the change in potential, in millivolts. (mV) pH: Indicates the change of the pH value of the solution. T: Indicates the temperature of the solution to be measured (C). This product can be widely used in the monitoring of pH value in solutions such as chemical industry, metallurgy, environmental protection, pharmaceutical, biochemical, food and tap water. Instrument parameters: 1. Measuring range: (-2 - 19.99) pH, -1999mV-1999mV 2. Resolution: 0.1/0.01pH, 1MV 3. Accuracy: 0.01pH 4. Input impedance: 1*1012 5. Stability: 0.01pH/3h 6. Temperature compensation range: (0 - 100) (automatic) 7. Accuracy range: 0.1%FS 8. Data storage: 200 groups 9. Power supply: AA*2 (1.5V x 2) 10. Size/weight: 340*270*50mm (outer box) / 1.5kg; 165*90*32mm (instrument)/0.31kg 11. Ambient temperature: 5-35C (level 0.01) Instrument Features: 1. Large-screen LCD display with controllable white backlight. 2. It has the functions of automatic calibration, automatic shutdown, power failure protection, automatic calibration, manual and automatic temperature compensation, and automatic diagnosis. 3. With undervoltage display prompt, automatic shutdown function to prolong battery life. 4. One to three points can be automatically calibrated. 5. By adjusting the equipotential point and selecting a special electrode, it can measure the pH value of ultrapure water, pure water and boiler water. 6. Support test result storage, deletion, viewing and printing, and can store up to 200 sets of experimental data. 7. The waterproof design of the standard portable suitcase, the protection level of the shell is IP57, and it is equipped with a foldable bracket. 8. Automatically recognize 12 kinds of pH standard buffer solutions, there are three series of standard buffer solutions to choose from: European and American series (USA), NIST series and Chinese series (CH), with custom solution calibration