A ruler, measure the length, width and depth of the book and multiply
A caliper would be the best tool for measuring the width of a pencil lead. It is precise and allows you to measure small dimensions accurately.
The width of a highway would be best measured in meters. The length would be measured in kilometers.
deli
Centimeter
It depends on the width of the desk. You could use centimeters or meters.
A micrometre. A millimetre would be too big a unit but a tenth of a millimetre should do fine.
Only if that volume is contained in a rectangular prism.
millimetres (or tenths of millimetres, if you have a micrometer)
The best measurement to use when measuring the width of a house fly is millimeters. This unit is precise enough to capture the small size of the fly, which typically measures about 6 to 7 millimeters in width. Using a ruler or caliper that can measure in millimeters will provide the most accurate results for such a small insect.
A measuring beaker.
A balance is the best tool for measuring mass.
That depends what you want to measure. Length and width: meters. Surface area: square meters. Albedo: A dimensionless number between 0 and 1. Etc.