It's gonna be inches/centimeters.
Centimetre
Metric ruler
A ruler or tape measure.
You can use millimeters.
Meter
Centimetre
Any metric unit would do. But it might be easier to pick something smaller than the length of the pencil, like a centimeter, or a millimeter.
Metric ruler
cm for a reg. hb pencil it's about 1 cm
Millimetres
a millimeter
A ruler or tape measure.
Metres.
Micron
meters
A metric ruler measures in inches and centimeters.
no clue sorry by.