Check the listing for details. Digital LCD EC/TDS Meter Water Quality Tester PPM Testing Kits Monitor 2 Pack. Color: White, Condition: New. Listed at 16.99 USD. Membrane Solutions Water Quality Tester, Accurate and Reliable,TDS Meter, EC Meter & Temperature Meter 3 in 1, 0-9990ppm,Water Test Meter for Drinking Water, Aquariums, etc. Advanced Features: High Accuracy: This 3-in-1 quality tester uses a food-grade stainless steel probe and ATC (Automatic Temperature Compensation) to read the temperature instantly to ensure that the water quality tester reads accurately at various temperatures, and does not test pH. 3 in 1 Function: This professional Water TDS meter can test TDS, EC, and temperature. It can measure the TDS value ranging from 0~4995 ppm and the EC value ranging from 0~9990 μs/cm. Auto off & Lock Functions: The TDS tester has a data-hold function, it locks your readings making them easy to record. The TDS tester has a power-saving function, and the digital water quality tester will automatically shut down after 5 minutes of standby. Backlit Display: The water quality tester uses an advanced LCD backlight display design, making readings easier and clearer. The data can be viewed clearly in the dark. You will prefer its comfortable shell. Multifunctional use: This TDS tester helps you find out the quality of the water for drinking, bathing, a cup of salt water, pools, etc. It also helps you gain a clear insight into the nutrient levels in hydroponic setups, garden soil, and so on. Instructions: 1. Open the pen cover and turn on the ON switch. 2. Place the pen in the solution to be tested. The height of the solution should not exceed 4 cm (from the tip of the pen). 3. Gently move the pen into the test solution and wait for the TDS pen to stabilize. 4. When the test is complete, wipe the pen with a cloth and put on the cap. Precautions: 1. Avoid boiling the pen in the water. 2. Avoid high temperature and direct sunlight 3. Avoid shocks and falls. Easy to Clean 3-in-1 Function Lightweight Pocket Digital Water Quality Tester Package list: 2x TDS Water Test Meter 2x Protective Case