A wide variety of tools exist which serve such functions, ranging from simple pieces of material against which sizes can be measured to complex pieces of machinery.
Dimensional properties include thickness, gap in space, diameter of materials.
[1][2] All gauges can be divided into four main types, independent of their actual use.
The two basic types with an analogue display are usually easier for the human eyes and brain to interpret, especially if many instrument meters must be read simultaneously.
The other two types are only displaying digits, which are more complex for humans to read and interpret.