The objective of the research project was to investigate various moisture testing techniques in an attempt to improve present methods of specific gravity testing for fine aggregate. A testing technique to reduce the wide range of specific gravity test results and the time necessary to test for saturated surface dry condition is needed. A direct test method to measure surface moisture conditions would be desirable where as an indirect test method is presently in use. A prototype test apparatus was developed, to directly measure surface moisture condition of mineral aggregate using basic principles of thermodynamics. The new test apparatus enables the laboratory technician to determine saturated surface dry state in a few minutes with satisfactory reliability.