225-7918 Fuel Moisture Sticks are used to estimate moisture content of small forest fuels for prescribed burning operations and to determine forest fire danger ratings. The sticks are placed over a duff bed of coniferous needles or hardwood leaves in the area where moisture is to be measured. The exposed sticks are then weighed on the 225-7917 Fuel Moisture Scale and the weight in excess of the oven-dry weight represents fuel moisture. Sticks should be replaced every 90 days.