It is a cheap and convenient digital tool can instantly check your overall water .<br> TDS means Dissolved Solids, which is any salt, metal or mineral in the water. With the of a button, TDS can tell you your overall water , and it will be displayed on the screen in ppm (parts per million). The lower the TDS content, the purer the water, and the pure water is 0 ppm. TDS is very suitable for checking the of tap water or knowing when to replace the filter. (The meter does not test for biological contaminants.)<br> TDS is an tool for drinking water, water filtration and purification, silver, hydroponics (testing nutrients), aquariums, /DI , swimming pools and spas, commercial and industrial applications, etc. TDS is a rugged and durable model includes a protective carrying case. This is a globally handheld TDS meter for industry . is Perfect for commercial use<br> It includes a suitcase with belt clip fixing function: due to advanced microprocessor technology and a built-in digital thermometer, measurement data can be stored efficiently and accurately for convenient reading Take and record; display: and easy to read LCD screen. digital TDS water are Perfect for testing applications such as hydroponics and , swimming pools and spas, aquariums and reef tanks, water ionizers, and water .<br> TDS water are Perfect for testing applications, including Perfect drinking water, water purifiers, carbon , spring water, hard water, tap water, refrigerator water purifiers, water purifiers, hydraulic , reverse osmosis, reverse osmosis .<br> Measuring range: 0-9990 ppm, 1 ppm resolution, + /-2% reading accuracy.<br> Power supply: 2 x 1.5 V (LR44 button battery) (not included)<br> colour: black<br> Material: astic<br> Size: 155mm<br> Package Contents:<br> 1 x TDS Pen<br> Only the above package content, other are not included.<br> Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.