Description: A TDS meter is a cost-effective andconvenient digital tool to instantly check your overall water quality, offeringmuch convenience for you and your families to get a more clean water. Features: TDS meter measuring principle is to measurethe electrical conductivity of water and indirectly reflects the TDS value.Test the impurities in water such as someelements of soluble salts, ionic organic compound, heavy metal ion, etc,offering much convenience for you and your families to get a more clean water.It supports hold function that can savemeasurement results for easy reading and record.Automatic power-off function allows it topower off after 5 minutes without any operation in order to save power.The TDS meter can be widely used foraquarium, beverages, quality control, fish hatcheries, food processing,laboratory, schools, colleges, swimming pools, etc. How to Use: 1. Take down the protective cap and pressthe ON/OFF button for turning on. 2. Put it into the ready to test solution, andthe solution height should not exceed 4cm (from the probe end to start) 3. Stirring the measuring probe in thesolution to be tested gently for stable data reading. 4. After use, please wipe and dry the probewith cloth, and put on the protective cover for storage. Specifications: TDS Range: 0-9990ppm Temperature Range: 0-99 Accuracy: 2% Battery Type: 2 * 1.5V LR44 ButtonBatteries(Not included) Size: Approx. 15.5*3*1.8cm/6.1*1.18*0.71in Weight: Approx. 70g Package Included: 1 * TDS Tester Note: 1.TDS (Total Dissolved Solids) is a measureof the combined content of all inorganic and organic substances contained in aliquid in molecular, ionized or micro-granular (colloidal sol) suspended form. 2.TDS measurements will influenced bytemperature, therefore for temperature compensation to correct readings, pleasepress the "hold" button for fixed numerical value in a few min