Accurate and reliable: Featuring advanced microprocessor technology and +/-2% reading accuracy, this TDS meter delivers efficient and precise measurements. The titanium alloy probe ensures high testing accuracy with reliable automatic temperature compensation (ATC) and resistance to magnetic field interference in water. Two measurement ranges: 09990 ppm. The TDS reading is displayed on an LED screen in PPM. Results are ready in 5 seconds.What is TDS: Total Dissolved Solids (TDS) refers to the total concentration of dissolved substances in water. A TDS meter is a water quality testing tool commonly used for drinking water, water filtration and purification systems, RO or DI systems, aquariums, hydroponics (nutrient testing), swimming pools, spas, and various commercial and industrial applications. This digital TDS meter is ideal for checking tap water quality and determining when to replace water filters.Why care about TDS: High TDS levels can affect the taste of water, making it salty, bitter, or metallic. Elevated TDS may also indicate the presence of minerals that can impact health. High TDS contributes to water hardness, which can lead to scale buildup on pipes, spots on dishes, and dry hair. Using a ppm meter helps monitor and avoid these issues. According to the EPA, the recommended maximum TDS level for drinking water is 500 ppm.Type: Without Battery (uses 2 x LR44 button batteries)Material: Plastic Color: White + BlackPackage Contents: 1 x TDS Meter Note: Light reflection and differences in display screens may cause slight variations in the color of the item shown in the image compared to the actual product. The physical product may have minor color differences, which do not affect functionality. Measurement error allowed: +/- 13 cm. Only the items listed above are included.