This monitor meets OSHA accuracy requirements of +/-25% for 8-hour TWA sampling of formaldehyde. Not for 15 minute STEL sampling. 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™ Formaldehyde Monitor 3720, with Prep