Product Description Equipped with advanced microprocessor technology, the Watts Premier Digital Water Purifier Tester stands out as a reliable tool for ensuring clean, safe, and high-quality water across various settings. This cutting-edge technology significantly enhances the tester's accuracy and efficiency, providing dependable results every time you test your water quality. This tester features a large, easy-to-read LCD screen with a clear, backlit display that ensures excellent visibility in a range of lighting conditions, making it user-friendly and simple for anyone to interpret the data. This tester measures Total Dissolved Solids (TDS) in your water, offering an extensive measurement range from 0 to 9990 parts per million (ppm). This wide range allows for versatile applications, making the tester suitable for various needs. Whether you're checking the purity of your drinking water, ensuring the water quality in a commercial setup, or assessing water in industrial processes, this tester provides the precision and range you need for accurate measurements. A notable feature of this tester is its built-in hold function, designed to save measurements for easy reading and recording. It also includes a built-in sensor that provides automatic temperature compensation. This advanced feature ensures that your TDS readings remain accurate regardless of water temperature fluctuations. The automatic temperature compensation function adjusts the readings based on the water's temperature, eliminating potential inaccuracies caused by varying thermal conditions. In addition, the Watts Premier Digital Water Purifier Tester is equipped with an auto-off function that shuts off the unit automatically after 10 minutes of inactivity. This feature is designed to conserve battery life, ensuring the tester is always ready when you need it while maximizing battery efficiency. From the Manufacturer TDS Meter; Tester measures the Total Dissolved Solids (TDS) In Water. TDS measurement is a simple efficient means for evaluating whether your RO System is working properly or not. Simply turn it on and dip the end in a glass of water. The tester will instantly give you a digital readout of the TDS in the water. To check RO membrane performance, test untreated water and then your RO water. Compare the results to determine the percent of removal. Most people replace the membrane when removal drops below 80 - 85%. Highly efficient and accurate due to its advanced microprocessor technology. Built in hold function saves measurements for convenient reading and recording. Meter comes with auto-off function so the unit will shut off automatically after 10 minutes of non-use to conserve batteries. Ideal for home, commercial and hydroponics use. Includes a carrying case with belt clip.