Centimeters
Centimeters
The length of a pencil. your waist/chest measurement the dimensions of a table
Centimetres, millimetres or inches would be most appropriate for measuring the length of a ruler.
a ruler!
Micrometer
A ruler would do the trick.
You would measure it in centimeters.
To measure the mass of a pencil, you would typically use a scale or a balance. Place the pencil on the scale or balance, and the device will provide you with the measurement of the pencil's mass in grams or ounces.
Centimeters
If you have to measure the pencil to a couple decimal places i would suggest a micrometer and a dial caliper.
A ruler or tape measure.
A kilometre.