This monitor uses a single charcoal sorbent wafer for collecting organic vapors. Accuracy of +/-25% at a 95% confidence level for many workplace contaminants. Includes prepaid analysis. Important Note: Effective immediately, the address this monitor is sent to for prepaid analysis has changed, the new address is: B.I.C. Chemistry Department, 11001 Hampshire Ave. S., Mpls., MN 55438 The 3M™ Organic Vapor Monitor 3510, with Pre