• Organic Vapor Monitor 3500-Single charcoal sorbent wafer for easy collection of organic vapors. Analysis by gas chromatography. Sampling and analysis guide for 125 vapors available.• Organic Vapor Monitor with Back-Up Section 3520- Primary and back-up sorbent pads are included for sampling demanding environments. Especially suited for monitoring compounds like acrylonitrile, butadiene and methylene chloride for which activated carbon shows limited capacity. It has two stages for increased sampling capacity. Analysis procedure is available upon request. • Ethylene Oxide Monitor 3550- Designed for sampling personnel or work areas in the pharmaceutical, health care and chemical industries. Analysis procedure is available upon request. Brominated carbon to collect and convert the reactive ethylene oxide to a more stable chemical derivative called 2-bromoethanol. This compound is then desorbed with methylene chloride in methanol. • Formaldehyde Monitor 3720- Monitors personnel or work areas in health care, laboratories and in the chemical, pulp/paper, foundry and textile industries. Analysis procedure is available upon request. This monitor does not have the sensitivity for short term exposure limit (STEL) monitoring.• All have an 18-month shelf life