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A TDS meter is a small hand-held device used to indicate the Total Dissolved Solids in a solution, usually water. Since dissolved ionized solids, such as salts and minerals, increase the conductivity of a solution, a TDS meter measures the conductivity of the solution and estimates the TDS from that reading. Water ph reagent liquid suitable for testing tap, Ground and RO Water. Place a few drops of the ph liquid to test your tap or drinking water ph level. Check results instantly with the color chart (pH 4.0-11.0). 20ml. The actual product may vary slightly from photograph. Measurement range : 0-9990 ppm Tolerance accuracy : ±2% Battery : 2×LR44 button battery Operating temperature: 0~50? Size : 155×31×23 mm Test item : Test water purity Advantages : Fast determination, high accuracy, waterproof and auto shut off. Application : Household drinking water, aquarium, swimming pools, ponds, etc. Used in many applications – Consumer and commercial Agriculture Aquariums & Aquaculture Car & Window Washing Colloidal Silver Drinking Water Environmental Testing Food & Coffee Service Health & Wellness Horticulture Hydroponics Pools & Spas Pharmaceutical & Medical Printing Industry Water Bottling Water Treatment Water Purification.