Many instruments are used to measure force. The most important is the force gauge or dynamometer. It's in fact a load sensor with a display. Those gauges are often mounted on a test stand or directly integrated in the frame.
Some of them are:
Force meter or Newton-meter
spring balance
spring scale
torque wrench
bathroom scale
strain gauge (Measures force within a material)
For examples of instruments that measure force visit the Related Link,
A newton meter, measured in N (Newtons)
A ruler can be used
A dynamometer is a tool for measuring force.
You use a Newton-Meter (Named after Isaac Newton).
Scale
A dynamograph is used in measuring mechanical force.
