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The In-Line Air Tester is used to check for any particulates or contaminants that may be running through the airlines that feed the paint gun. Contamination in the airlines can greatly affect the quality of the finish. Look for indicators of contamination on the filter paper after the test has been performed. The tweezers included in the kit are ideal for handling the filter papers, and the 30x magnifier is used for up-close examination. Commonly found particles include: (black, red or brown) Pollution of the compressed air such as oxides or rust, rubber from deteriorating hoses. Also can detect humidity, etc.