The moisture content can be determined using the Moisture tester based on the calcium carbide method. The soil sample is introduced in the bottle with the reagent. The water reacts with calcium carbide and develops a gas pressure, which is indicated on the manometer and easily converted in percentage of moisture.
BS 812, ASTM D4944, AASHTO T217
SL 0561 Calcium Carbide reagent ampoules pack of 100 pieces