Force gauge
Test units of force measurements are most commonly newtons or pounds. The peak force is the most common result in force testing applications. It is used to determine if a part is good or not. Some examples of force measurement: door latch, quality of spring, wire testing, strength ... but more complicated tests can be performed like peeling, friction, texture.
Gc (engineering)
In unit systems where force is a derived unit, like in SI units, "g" is equal to 1 and is not needed. In unit systems where force is a primary unit, like in English units, "g" is not equal to 1, and is required to obtain correct results.