- 6-in-1 Comprehensive Water Quality Testing : This professional-grade tester measures TOC, COD, EC, UV275, and TDS levels, providing critical insights into water pollution typically only found in laboratory settings. Ideal for home use, hiking, camping, travel, and emergency preparedness. - User-Friendly Display : The TDS meter simplifies water quality assessment with a clear rating system. It categorizes water quality into four levels: fine (blue), good (green), average (yellow), and poor (red). This feature is especially important for ensuring safe drinking water for children and pregnant women. - Compact and Portable Design : Measuring just 5.9 inches by 1.57 inches, this pen-style water tester is easy to carry, making it perfect for various applications such as drinking water, swimming pools, laboratories, hydroponics, aquariums, well water, tap water, and wastewater testing. - Simple Calibration Process : Calibration is straightforward—just immerse the tester in distilled or pure water, press the calibration button, and wait three seconds. Note: do not use mineral or natural drinking water for calibration. This water quality tester combines precision with convenience, ensuring you and your family have access to safe and clean water wherever you are.