Specific Gravity Testers is used to determine the specific gravity of uncompounded, compounded, and reclaimed stocks of unvulcanized rubber and rubber-like materials. It has complete hookup to a PC with BENZWIN2000 software for automated data collection and control. It shows dry weight, wet weight and specific gravity for each test. The average, standard deviation and coefficient of variation are automatically calculated after the second test, and the minimum and maximum values are also presented as well. It calculates volume swell by comparing historic data with the sample after aging. The difference is then presented in percent change. It is also used to evaluate the relative density through the comparative measurement in air and water.