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: 0-9990 ppm. The TDS reading is displayed on an LED screen in PPM. Results are ready in 5 seconds.What is TDS: Total Dissolved Solids, commonly known as 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, RO or DI systems, aquariums, hydroponics (nutrient testing), swimming pools, spas, and commercial or industrial applications. It is well-suited 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 tableware, and dry hair. Monitoring TDS levels helps avoid these issues. According to the EPA, the recommended maximum TDS level for drinking water is 500 ppm.Long battery life: The device is activated by pressing the "On/Off" button. Press the "Hold" button to freeze the reading. Powered by two 1.5V batteries, it offers a long operating life.Easy-to-read display: The digital TDS meter features a clear LCD screen for easy viewing of results. Battery powered: 2 x 1.5V (included, LR44 size).Measurement range: 0-9990 ppm Material: Plastic Color: Green Package Contents: 1 x TDS Meter Note: The package includes only the items listed above. Other accessories are not included. Note: Lighting and display differences may cause slight variations in color between the product image and the actual item. Measurement error is +/- 1-3 cm.