Key Features
•Enables continuous reading of VOCs under extremely humid conditions for about one half hour (per tube) at room temperature.
•Prevents drifting readings at high humidity when the sensor is dirty. Extends the time needed between sensor cleanings.
•Attaches to the Flex-I-Probe inlet with the same adapter used for ppbRAE VOC zeroing tubes.
•Especially useful for measuring chlorinated solvents and fuels under high humidity conditions as are often encountered during soil and water remediation.
•Can be used with other instruments having a built-in pump such as ppbRAE, UltraRAE, MultiRAE, and VRAE when humidity is an issue, such as PID or low-level LEL sensor measurements. (See TN-178 [on Downloads tab] for adapter connections or for further details.)

* Caution: Absorbs some compounds like ammonia and slows the response of heavy compounds, especially at low concentrations or low temperatures.
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http://www.magusintl.com/ppe/ViewProductDetails.asp?ProductID=714&aID=Sampling%20Tubes&L=4&CategoryID=17&CN=Sampling%20Tubes