They both have numbers.
inches, centimeters and millimeters
The one with shorter distances between the numbers.
A tyrant
you take a ruler and you measure each side and you multiply each numbers of each side
Put a ruler next to it and read the little numbers on the ruler...
2.5cm
by the numbers that are marked there
The numbers are to the left of the inch markers.
Stright edge
A length of two units!
It is often called a straight-edge.
They both have numbers.
inches, centimeters and millimeters
The one with shorter distances between the numbers.
Probably centimetres.
It could be a ruler. Just a number line.