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Multifunctional: One device measures total dissolved solids (TDS), electrical conductivity (EC), and temperature. Powered by 2 LR44 batteries (not included). Wide Measurement Range: Offers TDS range of 0-9999 ppm, EC range of 0-9999 µS/cm, and temperature range of 0-60 ℃ (32-140 ℉). Enhanced Accuracy: Equipped with 2 highly sensitive titanium alloy probes and an intelligent chip for precise results. User-Friendly Design: Features an enlarged backlit LCD screen for easy reading and a MODE button for quick value checks. Safety Alert Feature: Red backlit appears when TDS levels are 40 ppm or higher, suitable for various water applications including drinking, tap, well, and aquarium water.