Digital TDS Meter Ideal PH Water Quality Tester For Drinking Water 1-9990ppmOOTDTYechs: Total Dissolved Solids Meter with green/yellow/red light to indicate water quality level. Simply turn on the TDS meter and stir the water gently, then the stabilized readings will be automatically locked to the LCD display in seconds. Its TDS measurement range is 1-9999 ppm, PH is 0-14, ± 2% reading accuracy. To achieve high accuracy, equipped with the highest quality probes. Check the purity of the drinking water to make sure it is healthy, monitor if the Reverse Osmosis (RO)/DI System is working properly, if the filter requires , maintenance aquarium, hydroponics (test nutrients), pool and spa, etc. Specification: Material: ABS Measurement: 15.6x 3cm/6.1x1.2in Measurement Range: TDS: 1-9999 ppm, PH: 0-14Accuracy: ± 2%Resolution: 1 ppm Voltage: 3V Package Includes: 1x Water Quality MeterNote: Please allow 1-3cm error due to manual measurement. Pls make sure you don't mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.