Description: TDS instrument is a cost-effective and convenient digital tool that can immediately check your overall water quality, providing great convenience for you and your family to obtain cleaner water.Characteristics: The measurement principle of TDS instruments is to measure the conductivity of water and indirectly reflect the TDS value. Testing impurities in water, such as soluble salts, ionic organic compounds, heavy metal ions, etc., provides many conveniences for you and your family to obtain cleaner water. It supports retention function and can save measurement results for easy reading and recording. The automatic power off function allows it to power off without any action after 5 minutes, in order to save power. TDS instrument can be widely used in aquarium, beverage, quality control, fish hatchery, food processing, laboratory, school, college, swimming pool, etc.Usage: 1. Remove the protective cover and press the on/off button to open it. 2. Place it in the prepared test solution, and the solution height should not exceed 4cm (from the probe end to the beginning). Gently stir the measuring probe in the solution to be tested to obtain a stable data reading of 4. After use, please dry the probe with a cloth and wear a protective cover for storage.Specification: TDS range: 0-9990ppm Temperature range: 0-99 Precision: 2% Battery type: 2 * 1.5V LR44 button cell (not included) Size: about 15.5 * 3 * 1.8cm/6.1 * 1.18 * 0.71 inchNote: 1. TDS (total dissolved solids) is a measure of the total content of all inorganic and organic substances contained in the liquid in molecular, ionized or particle (colloidal sol) suspension form. 2. TDS measurement will be affected by temperature. Therefore, to conduct temperature compensation to correct the reading, please press the "Hold" button within a few minutes to obtain a fixed value. 3. The larger the TDS value, the more dissolved solids, The smaller the value of TDS, the less water-soluble solids there are. Less total dissolved solids, more purified water for you. Color: As shown in the picture Package includes: 1 * TDS tester Attention: Due to manual measurement, please allow for a slight error. Please make sure you don't mind before bidding. 2. Colors may vary depending on the monitor, please understand. Hello, please pay attention to your shipping address when purchasing products. If your delivery information (such as name, street, house number, doorbell/email without name, etc.) is incorrect, the order will not be delivered correctly