The Indoor Air Formaldehyde Passive Sampler is the only device specifically designed for accurate indoor measurements of low formaldehyde levels in the home, office, or industrial environment over a 5- to 7-day period.

The sampler is inexpensive, accurate, and field validated by the Indoor Air Quality Program, Lawrence Berkeley Laboratories at the University of California, Berkeley. The sampler is the first of its kind requiring no special equipment or trained personnel for sampling. The sampler is based on a simple yet accurate process. Inside the vial is a disk of chemically impregnated paper. No liquid reagents are necessary for sampling. Formaldehyde combines with the reactive media on the disk (sodium hydrogen sulfite) and forms the stable compound sodium formaldehyde bisulphite.

The sampler is then sent to an AIHA-accredited laboratory for chromotropic acid assay (CTA) analysis. There are no known interferences to the sampler. Formaldehyde may be accurately measured in the presence of other substances such as phenol, aldehydes, and aromatic hydrocarbons. Shelf life of an unopened sampler is one year.