Check the listing for details. PH Meter Digital TDS Meter EC&Temperature Water Quality Tester for Drinking,Pool. Condition: New. Listed at 5.99 USD. Digital TDS Meter Water Quality Tester, 0-9990 PPM, Portable Carry Case What Is TDS and Why Should You Care? First we need to understand what is the TDS , TDS (Total dissolved solids) is a measurement of all solids dissolved in drinking water, and is mainly made up of minerals. A high level of TDS is an indicator of potential concerns and should be investigated before drinking. The U.S. EPA suggests a maximum level of 500 ppm. TDS meter is widely used in all water quality tests. Water Purification Applications, Aquaculture, Hydroponics, Pool & Colloidal Silver, Water Treatment and more. It is a must-have item for the family and can test tap water, distilled water, well water, bottled water and more. With one-button switching, it is easy to know the TDS value and conductivity value, and it is easy to operate. In addition, the meter can also switch between Celsius and Fahrenheit. The range of Fahrenheit is 32.0-176°F, and the range of Celsius is 0-80.0°C. At the same time, it also has automatic temperature compensation.This is your ideal product for testing water quality. Specification Measurement Range: TDS: 0-9999 ppm ± 2% EC: 0-9999 μs/cm ± 2% Temperature: 32.0-176.0°F (0-80.0°C) Auto-off Function: Extend the battery lifetime. HOLD Function: Press HOLD to lock and record the readings. SHIFT Function: Press SHIFT button once to choose between TDS and Conductivity (EC). Press SHIFT button twice to choose between Celsius and Fahrenheit. Package list 1*TDS&EC Meter 1* User Manual 1* Leather Case Digital Water PH Meter Tester Water Quality Test Pen size Portable PH Test Pen 0.00-14.00pH Measurement 80 Strips Full pH 1-14 Test Indicator Litmus Paper Water Soil Testing Kit Package list:1. 1x Red PH Pen Meter2. 1x TDS&EC(Without LCD Back-light)3. 1x TDS&EC(With LCD Back-light)4. 1x Yellow Ph Meter5. 1x Yellow Ph Meter, 1x TDS&EC(With LCD Back-light)6. 1x Yellow Ph Meter, 1x TDS&EC(Without LCD Back-light)7. 2 Pack ph test paper