Air Systems breathing air quality test kits are designed to test the air produced by compressors (Model LP-A4) and compressed air in cylinders (Model HP-A4 and HP-A445). These tests are accomplished through the use of low cost detector tubes that provide a "go/no go" test of the air quality. If a high reading is found, this signals the user that they have a potentially unacceptable quality of breathing air. If this occurs, a laboratory analysis of the air components must be made to determine the exact readings of the air quality and take corrective action.