For quick determination of moisture content of materials in powder from i.e. Soil sand, coal, pottery, ganister, cement etc. A weighed quantity of the substance under test is placedin the body of the tester together with a measured quantity of absorbent and the tester isthen sealed and shaken vigorously thereby bringing the sample and the absorbent intointimate contact. The pressure of gas liberated by interaction of moisture in the sampleand absorbent actuates the gauge which is directly graduated in percentage moisture onthe wet weight basis. A conversion chart is provided for converting percentage moisturecontent on the wet weight basis to percentage moisture on the dry weight basis.the unitconsists of a pressure vessel with clamp for sealing cap rubber sealing gasket, dial gaugecalibrated in percentage moisture content to 25 % on the wet weight basis, counter poisedbalance for weighing sample, scoop for measuring absorbent, bottle of absorbent, cleaning brush. Complete in wooden carrying case with handle.the unit can be used todetermine percentage moisture contents on the wet weight basis up to 25% which is equalto 33.3% moisture content on the dry weight basis.