Set aside the roll of paper whose moisture level you want to check. The amount of moisture is measured as a percentage of its mass relative to the total mass of the paper, and it's assumed that the moisture is evenly distributed in the entire paper.
Cut a segment of the paper roll using scissors and place it on the weighing scale, then note its reading. It is advisable to use an extra-sensitive weighing scale to measure accurately the weight of the paper.
Place the paper sample in an oven set at 221 degrees Fahrenheit. Leave the paper to dry in it for one hour before removing it from the oven. Transfer the paper to the weighing scale once more to measure its weight after the moisture is removed from it. Take the reading and compare it to the first reading you took before drying it. The second reading is always less than the first, and the difference varies depending on the amount of moisture in the paper.
Calculate the difference in the two weights by subtracting the last reading from the first. The answer that you get is equivalent to the weight of the moisture in the paper sample. Express the weight of moisture as a percentage of the original paper weight by dividing the difference in moisture weight by the original weight, then multiplying the quotient by 100. The product is the percentage of moisture in the paper roll.