Water activity is a measure of the amount of water that is unbound (i.e. free) and available to microorganisms to use for growth. It is an important indicator of microbial contamination in cannabis products. At a high water activity (>0.65 aW), there is a higher chance of microbial growth and contamination. Spectra Analytical utilizes a water activity meter that uses laser precision to give accurate results for even the most challenging volatiles.