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3Mâ„¢ Organic Vapor High Sampling Rate Monitor 3501+ is a cost-effective and convenient way to perform personal air sampling for low levels of organic vapors and short term exposure limit (STEL) sampling. 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.