Formaldehyde is used in the production of many household and building products and its health hazards are well recognized. Airborne formaldehyde concentrations can be measured using several different techniques, including laboratory-based methods and direct-reading instruments. For this study, two commercially available direct-reading instruments, an RKI Instruments Model FP-30 and a PPM Technology FormaldemeterTM htV, were compared with NIOSH Method 2016 in different test environments to determine if these direct-reading instruments can accurately measure formaldehyde.