Review on 🔬 Accurate and Reliable TDS Water Quality Test Meter with Large Backlit LCD Screen, Professional TDS and Temperature Measurement at an Affordable Price. by Brad King

Works immediately after installation. We don't have an independent benchmark, but all measurements were within the expected range. Tap water was at 400, RO filtered at 30-40 and refills from a spring water company at 60-70. And just for fun, the reverse osmosis filter waste drain was measured at . We are glad to have this easy to use TDS tester! Used a few times in the past few months with no problems.