TDS Meter Digital Tester:tds water quality tester uses a highly sensitive probe and can provide accurate and reliable results in just 1 second after being immersed in the tested water. TDS water test kit also features a high-definition LED screen, which makes it easy even for children to read the results clearly. Accurate and Reliable: The tds meter Highly efficient and accurate due to its advanced microprocessor technology, +/- 2% Readout Accuracy Testing,the titanium alloy probe has high test accuracy,Testing range from 0-9990 ppm,The TDS meter reading will be displayed on the LED screen in ppm Long battery life cycle:Press “ON/OFF” button and the ppm meter will work. Pressing “HOLD” button and the reading value will be held though. It’s used with 2pcs 1.5V batteries,it will be power-off automatically after stop using in 5 minutes to save the battery Easy To Read Display：A large, easy-to-read LCD screen display on this TDS water testing meter makes it easy to see results. Its power source is 2 x 1.5 V including button cell batteries (LR 44 size). Water Testing Kits:for drinking water, drinking water, water filtration and purification systems such as RO or DI systems, aquariums, hydroponics (test nutrients), pools and spas, commercial and industrial applications and more. The tds meter digital water tester is great for checking your tap water quality and knowing when to change a filter.