Specifications: Use to measure the PH & EC & TDS & TEMP of solution. Large LCD screen to display the result, easy to read with high precision. Apply in water sources, aquarium, hydroponics, spas, swimming pools and other water systems. Item Name: Water Quality Tester Material: ABS PH Range: 0.00-14.00PH EC Range: 0-1999s/cm, 0-19.99mS/cm TDS Range: 0-1999ppm, 0-19.99ppt Temp Range: 0-50 Celsius PH Resolution: 0.01PH EC Resolution: 1s/cm (1999us/cm), 0.01mS/cm TDS Resolution: 1ppm (1999ppm), 0.01ppt Temp Resolution: 0.1 Celsius PH Accuracy: 0.02PH EC Accuracy: 2%F.S TDS Accuracy: 2%F.S Temp Accuracy: 0.5 Celsius Automatic Temperature Compensation: 0-50 Celsius Battery: 3 x 1.5V AG13 Battery (Included) Working Temperature: 0-50 Celsius Calibration: 2 Points (6.86, 4.01) or 1 Point (6.86) Calibration Auto Power-off: 8min Features: 4 in 1, Easy to Read, Portable Size: 18.8cm x 3.5cm x 3.5cm/7.4" x 1.38" x 1.38" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Water Quality Tester