It really is a useful little tool. Lets me know just how much pressure I am putting on things in the press. You could also use it to calculate the weight of something very large, like lifting a house. Remember to calculate the size of your piston to get the multiplier you use to calculate real pressure. Piston area X pressure on gauge = weight. Mine was an easy to remember 1.23 so at 1000 psi the press is pushing down at about 1200 pounds. Easy.