The new HDS™ Personal Monitor Exposure Chamber allows laboratories to prepare and validate virtually any volatile chemical’s sampling rates relative to the collection rate of air when using the Entech HDS™ Personal Monitors. Although sampling rates do not vary much on a compound by compound basis, our new exposure chamber will allow the verification of exact rates of virtually any volatile chemical to within a few percent, measured against the gravimetrically determined weight gain achieved during the sampling process. No other IH technique has such an accurate means by which to measure the amount of sample collected “during” the sampling event. HDS™ Personal Monitors collect chemicals at a relative rate that is about 75–95% as fast as the collection of air. This exposure chamber can obtain specific sampling rate data on 4 HDS™ Personal Monitors at a time and the validation process is easy. Neat, or multi-component liquid standards can be injected into the exposure chamber and allowed to equilibrate to achieve the desired gas phase concentrations before HDS™ Personal Monitor sampling.