Feature 1Large LCD displays PH or mV and Temperature simultaneously 2The backlight starts automatically after power on for easy viewing at day or night 3Measures PH range 0-14 with 0.01 resolution. Highly accurate for up to 0.05PH variance 4Calibration check function to validate instrument performance 5Wide variety of uses: Suitable for water sources, schools & colleges, laboratories, pharmacy, fermentation, etcThe 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 PH or mV and Temperature simultaneously. The backlight starts automatically after power on for easy viewing at day or night. Measures PH range 0-14 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 display Measurement range: PH: 0PH~14PH, mV: -415mV~415mV Resolution ratio: 0.01PH,1mV PH measurement error: 0.05PH mV value measurement error: 0.1%FS The temperature of the measured solution: 5~60 Temperature compensation scope: 0~60 Automatic power-off time: 4 minutes Size: Approx. 165*75*32mm/6.5*3*1.3inch Weight: Approx. 692g / 24.4oz Normal use condition of the instrument 1. 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 Meter 1packet x PH4.00 Standard Buffer Reagent 1packet x PH9.18 Standard Buffer Reagent 1packet x Potassium Chloride Powder 1 x Electrode Soaking Liquid 1 x PH Non-chargeable Combination Electrode 1 x Manual 1 x Black Case Note: 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.