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.
Introduction to the metric system
On the eve of the French Revolution, France had an estimated quarter of a million different units of measurement. In many cases the value of a unit differed from town to town and even from trade to trade even though they might have the same name. While certain standards, such as the "pied du roi" (the King's foot) had a degree of pre-eminence and were used by savants (scientists), many traders used their own measuring devices. This gave scope for fraud and hindered commerce and industry. The metric system was designed to replace this confusion with a radical new system with fixed values.
In England, Magna Carta in 1215 decreed that "there shall be one unit of measure throughout the realm", However, France and the rest of Europe had a multitude of measurement units. The differences were like those between United States customary units and United Kingdom imperial units that measure liquids a US pint consists of 16 US fluid ounces while an imperial pint is 20 UK fluid ounces and the US fluid ounce is about 4% larger than the UK fluid ounce. Differences such as these occurred across Europe.