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 test ranges: 0-9990 ppm. The TDS reading is displayed on an LED screen in PPM (parts per million). Results are ready in approximately 5 seconds.What is TDS: Total Dissolved Solids (TDS) refers to the total concentration of dissolved substances in water. This digital TDS meter is a water quality testing tool ideal for drinking water, water filtration and purification systems (such as RO or DI systems), aquariums, hydroponics (nutrient testing), swimming pools, spas, and various commercial and industrial applications. It is especially useful 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 potentially harmful minerals. 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: A - Without Battery / B - With Battery (2 x LR44 button batteries included)Material: Plastic Color: White + BlackPackage Contents: 1 x TDS Meter (Other items not included)Note: Slight color variations due to lighting or display differences may occur and are not considered defects. Measurement error tolerance: +/- 1-3 cm.