They both have numbers.
inches, centimeters and millimeters
The one with shorter distances between the numbers.
A tyrant
NO. you don't start to count from negative numbers do you ? Start from 0
2.5cm
by the numbers that are marked there
Stright edge
The numbers are to the left of the inch markers.
It is often called a straight-edge.
They both have numbers.
inches, centimeters and millimeters
A length of two units!
The one with shorter distances between the numbers.
Probably centimetres.
It could be a ruler. Just a number line.
It could be called a straight edge.