The 3M™ Formaldehyde Monitor is a cost-effective and convenient way to perform personal air sampling for formaldehyde and other certain aldehydes. It is easy to use, simply clip it to your shirt lapel, collar, or pocket without interfering with your work activities. No batteries, hoses, or pumps are needed to use the monitor to sample your air.The 3M Formaldehyde Monitor uses diffusion, rather than a pump, to collect an air sample with an accuracy of +/-25% at a 95% confidence level for certain aldehydes found as workplace contaminants. This monitor is fibreglass coated with 2,4-dinitrophenylhydrazine (DNPH) for easy collection of aldehydes and is typically used in health care, laboratories, and in the chemical, pulp/paper, foundry and textile industries. After following all instructions, send the monitor to be analyzed in the lab of your choice. This monitor has a 1-year shelf life from it's production date.