Model T75 Waterproof TDS tester with automatic temperature compensation and 1 point manual calibration range: 0.0 to 1999 ppm (mg/L), replaceable MA73075 probe. The durable Sharp TDS Waterproof Tester is an easy-to-use portable tester. It offers one-point manual calibration and measures from 0-1999 ppm. Resolution is 1 ppm with an accuracy of ±2% full scale. The TDS meter offers automatic 0-50 °C temperature compensation from steel-housed sensors with an extended battery life for up to 250 hours of continuous use. This tester floats and is pressure tested to six feet. Includes three, 1.5-volt batteries and carrying case. The durable Sharp TDS Waterproof Tester is an easy-to-use portable tester. It offers one-point manual calibration and measures from 0-1999 ppm. Resolution is 1 ppm with an accuracy of ñ2% full scale. The TDS meter offers automatic 0-50 °C temperature compensation from steel-housed sensors with an extended battery life for up to 250 hours of continuous use. This tester floats and is pressure tested to six feet. Includes three, 1.5-volt batteries and carrying case.