Centimetres, millimetres or inches would be most appropriate for measuring the length of a ruler.
Micrometer
Centimeters
Centimeters
The length of a pencil. your waist/chest measurement the dimensions of a table
You could measure the mass with grams.
No, a pencil is not a unit of measurement.
A vernier caliper would be a good way, unless you need a more accurate measurement, in which case I might use a micrometer caliper.
a ruler
The answer will depend on whether you want the mass of a pencil, its weight, its length, width, volume. You may want to measure its colour!
a ruler
You would measure it in centimeters.
Pencil lead is very narrow. Millimeter can be used to measure it.