The exponentially better UMEx 100 Passive Sampler for Formaldehyde was developed in collaboration with the National Institute of Working Life (formerly the National Institute of Occupational Health) in Umea, Sweden.

Constructed of tough polypropylene, the UMEx 100 contains a tape impregnated with 2,4-dinitrophenylhydrazine (DNPH) for reliable collection of formaldehyde. Samplers are provided in individual aluminized pouches that can be reused to transport the sampler to a laboratory after sampling. For convenience and quality control assurance against contamination, each sampler incorporates a "blank" section in addition to the active sampling section so there is no need to send extra samplers to the laboratory.

Sampling with the UMEx 100 Sampler is very easy and requires no pump or training. Simply remove the badge from the pouch, record sampling information on the back of the sampler, and slide cover to the "on" position. Clip the sampler on a worker for personal sampling up to 8 hours or in an appropriate location for area sampling up to 24 hours or 7 days.