This monitor uses a single charcoal sorbent wafer for collecting organic vapors. Accuracy of +/-25% at a 95% confidence level for many workplace contaminants. Bulk packed. Analysis not included. The 3M™ Organic Vapor Monitor 3500 uses the proven scientific principle of diffusion, which is the gradual mixing of molecules of two or more substances. It has a single charcoal sorbent wafer for easy collection of organic vapors and can be used for