Measuring instruments
Definition :
A measurement instrument is a tool or device in which we can determine the value or amount of the quantity to be measured:
The measuring quantity can be length with uncertainty.
*There are many instruments used to measure the quantities physical, for example we mention:
Ruler
Ductal foot
Palmer
Ductal foot
Ductal foot and Palmer as showing can measure dimensions as approach and exact values with uncertainty and errors.
Other instruments about specific quantities are used in every category.