The product is convenient to use and simple to operate with high measurement precision and is suitable for environmental protection, waste water treatment, chemical laboratories, pharmacy, fermentation, chemical engineering, tap water and other fields.Features:Large LCD displays PHor mV and Temperature simultaneously.The backlight startsautomatically after power on for easy viewing at day or night.Measures PH range0-14 with 0.01 resolution. Highly accurate for up to ±0.05PH variance.Calibration check function to validate instrument performance.Wide variety of uses: Suitable for water sources, schools & colleges, laboratories, pharmacy, fermentation, etc.Specification:LCD display: three and a half digit displayMeasurement range: PH: 0PH~14PH, mV: -415mV~415mVResolution ratio: 0.01PH,1mVPH measurement error: ±0.05PHmV value measurement error: ±0.1%FSThe temperature of the measured solution: 5~60℃Temperature compensation scope: 0~60℃Automatic power-off time: 4 minutesSize: Approx. 165*75*32mm/6.5*3*1.3inchWeight: Approx. 692g / 24.4ozNormal use condition of the instrument1. Environment temperature: 5~40℃2. Relative humidity: ≤85%RH(No condensation)3. Power supply: 3 x AA batteries (NOT included)4. No vibration affecting performance in surrounding area. 5. No corrosive gas in the surrounding air 6. No other magnetic field interference except earth magnetic field.Package List:1 x HT-1202 PH Meter1packet x PH4.00Standard Buffer Reagent1packet x PH9.18Standard Buffer Reagent1packet x Potassium Chloride Powder1 x Electrode Soaking Liquid1 x PH Non-chargeable Combination Electrode1 x Manual1 x Black CaseNote: 1. When the screen displays low power, please replace the battery in time.2. The water used to prepare PH6.86 and PH9.18 solutions should be boiled 15-30 minutes in advance to remove dissolved carbon dioxide. During cooling, avoid contacting with air to prevent carbon dioxide pollution..