Force meter
A force meter is an instrument to measure the magnitude of a force. This is often just a spring contained within a cylinder that has a scale to mark the extension of the spring produced by the force. In the International System of Units, the unit of force is the newton (symbol N). A force meter that measures force in newtons may be referred to as a newtonmeter.
English Engineering units
In English Engineering units, the pound mass and the pound force are distinct base units, and Newton's Second Law of Motion takes the form "F" = "ma"/"g", where "g" = 32.174 lb·ft/(lbf·s).