What measuring tool measures mass?
A balance is the most common method of measuring mass.
A force meter, also known as a Newton meter, is a tool for measuring the amount of Newtons a force is. (Forces are measured in Newtons.) It consists of a tube with measures on the side and a spring with a hook on the end. You place a weight on the hook and the spring will stretch accordingly, letting you take a reading of the mass in Newtons.