3M™ Organic Vapor Monitors capture a wide range of organic vapors. These compact monitors clip easily to shirt lapel, collar, or pocket and don't interfere with employee activities Monitors collect certain organic vapor type airborne contaminants using the scientific principle of diffusion. A sorbent pad in the base collects and holds the organic gases and vapors until desorbed for analysis in a laboratory. Monitors have an 18-month shelf life.