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A pH strip is specifically designed to measure the acidity or alkalinity of a solution, providing a convenient and quick way to determine the pH level of various products. When a pH strip is immersed in a solution, the strip will change color based on the pH level, allowing the user to compare the color against a provided scale to ascertain the exact pH. This method is widely used in various fields, including cosmetics, chemistry, and biology, to ensure that products are formulated within a specific pH range for safety and effectiveness.

Other tools mentioned in the choices serve different purposes. For instance, a hydrometer measures the specific gravity of liquids, which is not related to pH. A thermometer measures temperature, providing information on how warm or cool a substance is but not its pH level. A scale is used to measure weight, which again does not indicate pH. Therefore, among the options, the pH strip is the most suitable for assessing and determining the pH level.