TDS meter is a tester measures total dissolved solids(minerals, salts or metals) in water, TDS-3 has one screen and three buttons on its face, one clip on its back, very simple to use and carry. Comes with a leather case to protect it from damages, ideal for home and commercial water quality checking and monitoring. Specification TDS meter is a water quality tester measures total dissolved solids(minerals, salts or metals) in water, TDS-3 has one screen and three buttons on its face, one clip on its back, very simple to use and carry. Comes with a leather case to protect it from damages, ideal for home and commercial water quality checking and monitoring. Features Hold function saves readings Auto-off turns off in 10minutes to save batteries Factory calibrated Customised label and logo Technical data Testing Range: 0-999ppm Accuracy: 2% Battery: 2x1.5V(button cell)