A unit of measurement refers to a specific magnitude of a quantity, described and approved by convention or by law, that is used as a standard for measurement of the same kind of quantity.
Any other quantity of that type can be stated as a multiple of the unit of measurement. As for instance, a length is a physical quantity.
Standard unit of measurement :-
Type - U.S. Unit - Metric Unit
Length - Inches, Feet, Yards, Miles - Millimeters, Centimeters, Meters, Kilometers
Weight - Ounces, Pounds - Grams, Kilograms
Time - Seconds, Minutes, Hours - Seconds, Minutes, Hours
Volume - Ounces, Gallons - Milliliters, Liters
Given below, the details of measurements which are utilized in surveying and construction works :-
For construction work: feet, inches, fractions of inches (m, mm)
For most surveys: feet, tenths, hundredths, thousandths (m, mm)