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.
Poundal
English units require re-scaling of either force or mass to eliminate a numerical proportionality constant in the equation "F = ma". The poundal represents one choice, which is to rescale units of force. Since a pound of "force" (pound force) accelerates a pound of "mass" (pound mass) at 32.174 049 ft/s (9.80665 m/s; the acceleration of gravity, "g"), we can scale down the unit of force to compensate, giving us one that accelerates 1 pound mass at 1 ft/s rather than at 32.174 049 ft/s; and that is the poundal, which is approximately of a pound force.