These kits provide a convenient means to test the purity of compressed breathing air from compressors, plant supplied air systems or high pressure air cylinders for self-contained breathing apparatus. It is often used by firefighters. Checking the levels of carbon dioxide, carbon monoxide, oil and water vapor, high pressure kits include adapters for 200 / 300 bar or in U.S.A. for 2216 / 4500 psi SCBA.