You need an Engineer's Micrometer which will be accurate to either 1 hundredth of a MILLIMETRE, Or to 1 thousandth of an INCH.
Millimeters, or centimeters.
You would use millimeters (mm) to measure the thickness of a house key, as it is a small unit appropriate for measuring such dimensions.
The best unit is a litre.
You would typically use millimeters (mm) to measure the thickness of a coin. This unit is commonly used for measuring small distances or thicknesses.
The best unit for measuring the length of a pencil is inches.
It's asking for how thick it is not the length of it. So the obvious answer is not centimeters or meters. It would be millimeter.
The thickness is of the order of a millimetre so a smaller unit - a micrometre, perhaps - is suitable.
Millimeters, or centimeters.
millimetres
mm
You would use millimeters (mm) to measure the thickness of a house key, as it is a small unit appropriate for measuring such dimensions.
The best unit is a litre.
You would typically use millimeters (mm) to measure the thickness of a coin. This unit is commonly used for measuring small distances or thicknesses.
Micrometres.
The best unit for measuring the length of a pencil is inches.
Gram
a millimeter