3M Organic Vapor Monitor 3500+ is a cost-effective and convenient way to perform personal air sampling for many organic vapors. It is easy to use - clip it to your shirt lapel, collar, or pocket without interfering with your work activities. No batteries, hoses or pumps or needed to use the monitor to sample your air.Knowing the specific contaminant and exposure levels is important to determine the appropriate respirator and cartridge for your work environment. This information will also help in estimating the life of selected 3M Cartridges. 3M Organic Vapor Monitor 3500+ uses diffusion, rather than a pump, to collect an air sample with an accuracy of +/-25%, at a 95% confidence level for many workplace organic vapors, for both personal or area sampling. It contains a single charcoal sorbent wafer for easy collection of organic vapors and can be used for most applications. After following all instructions, send the monitor to be analyzed in the lab of your choice. This monitor has a 2-year shelf life from its production date.