Feature:1. Humanized design, LCD blue light display is more effective for eye protection. The electrode can be detached, and it is more convenient to replace the electrode.2. Automatic shutdown function, the power will be automatically turned off after 8 minutes, which can save power without operation and last longer.3. The portable salinity meter can be carried anywhere to measure water quality, such as tap water, RO system water, aquarium, mariculture, food inspection, etc.4. Multifunctional tester, it has 5 kinds of functions including test TDS, EC, pH, salinity, and temperature of the liquids.5. With automatic temperature compensation function, the measurement is more accurate. ABS materials is lightweight yet durable, easy to operate.Specification:Item Type: Water Quality TesterMaterial: ABSColor: As shown in the pictureSize: Approx.188x38x38mm/7.4x1.5x1.5inProduct Model: PH-3509Measuring Range:PH: 0-14PHEC: 0-1999uS/cm 0-19.9mS/cmSalinity: 0-42%Temperature: 0-50Resolution:PH: 0.1PHEC:1s/cm (<1999s/cm)10us/cm (>1999 us/cm)0.1mS/cmTDS:1ppm (<1999ppm)10ppm (>1999ppm)0.1pptSalinity: 0.1%Temperature: 0.1Accuracy:PH: 0.1PHEC: 2%F.STDS: 2%F.SSalinity: 2%F.STemperature: 0.5Compensation Temperature: 0-50Power Supply: 3x1.5V AG13 (Not Included)pH Calibration: 2 points (4.01, 6.86) or 1 point (6.86) calibration (without calibration fluid)Automatic Shutdown: About 8 minutes.Package List:1 x Water Quality Tester(Battery Not Included)1 x Screwdriver1 x Instruction ManualNote:1. Please allow 1‑2in 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.