The product is convenient to use and simple to operate with high measurement and is suitable for environmental , waste water treatment, laboratories, pharmacy, fermentation, engineering, tap water and other fields. Specification: LCD display: three and a half digit display Measurement range: PH: 0PH~14PH, mV: to 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 to 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 to 30 minutes in advance to remove dissolved carbon dioxide. During cooling, avoid contacting with air to prevent carbon dioxide .