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Q:Why the same water, the results of each test are not the same phenomenon? A:When the TDS meter is inserted into the water, the air bubbles will be attached to the electrode under test, which needs to be shaken to remove the air bubbles, and the result will be more accurate. Q:Can this be used as a thermometer to test boiling water temperature? A;No, this temperature sensor is installed inside the product and is mainly used to test the ambient temperature. The purpose is to automatically compensate and calibrate the relevant values when testing TDS. Q:Why is the temperature displayed when testing the water temperature inaccurate? A:This cannot be used as a professional thermometer. The built-in temperature sensor is mainly used to test the ambient temperature of the water to be measured, so the response is relatively slow during temperature measurement. Because the temperature sensor is built-in and does not directly touch the water. Q:Can this test for those tiny impurities in dusty water? A:No, this is mainly to test substances dissolved in water, such as our common chemicals, such as salt, sugar, perfume, alcohol, etc., and cannot test particles of solid substances, such as sediments, etc. Product Dimensions: 1.2 x 0.6 x 6.1inches Shipping Weight: 2.7 ounces