The Milwaukee Instruments MW402 TDS meter is a versatile and reliable tool designed to measure Total Dissolved Solids (TDS) in water. This meter provides precise readings within the range of 0.0 to 10.0 grams per liter, making it ideal for maintaining optimal conditions in saltwater reef aquariums. It includes automatic temperature compensation (ATC), ensuring accurate measurements regardless of water temperature changes. The MW402 is best suited for hobbyists and professionals who require consistent quality control over their water parameters. Its manual calibration feature allows users to maintain peak performance through regular checks, while its durable design supports long-term use in various environments.