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oride and 5% dextrose diluents for at least 4 hours at the concentrations tested in this study.Water activity refers to the amount of water in a system that is available for microbial growth. Commercial water activity meters are precision instruments with the ability to determine water activity to within 0.001 units and carry prices of $10,000 or more. The purpose of the study was to build a robust water activity meter from commercially available components and measure the water activity of liquids commonly used in compounded for