The Hanna Instruments HI-98302 Pocket TDS Tester is a reliable and efficient tool for measuring the total dissolved solids (TDS) in pool water. With a measurement range of 0.00 to 10.00 ppm (parts per million), this handheld tester allows users to easily monitor the water quality and ensure it is within the optimal levels for a clean and safe swimming experience. Manufactured by Hanna Instruments, a trusted brand in water testing equipment, this pocket TDS tester is a practical and essential tool for maintaining proper pool water conditions.