【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, reliable Automatic Temperature Compensation (ATC),which can avoid the interference of magnetic field in water. 2Testing range from 0 9990 ppm, ppm. The TDS meter reading will be displayed on the LED screen in ppm (parts per million), one million). One measurement can be completed within 5 seconds. 【What is TDS】: Total Dissolved Solids, also known as TDS. The TDS meter is a great water quality tester tool for 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. 【Why care about TDS】: High TDS level will change the taste of water,making it salty, bitter or metallic. High levels of TDS also indicate the presence of toxic minerals which is harmful to health. High TDS will harden the water, cause fouling in pipes, dry hair, spots on tableware and also make the kitchen utensils useless. A ppm meter can help you to avoid above problems. According to the EPA, the maximum concentration of TDS for drinking water is 500 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, can use more than 2 years, 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).