They both have numbers.
inches, centimeters and millimeters
The one with shorter distances between the numbers.
To read a hundreds ruler, first identify the scale marked with numbers from 0 to 100, which represents centimeters (or millimeters, depending on the ruler). Each increment between the numbers typically represents one centimeter. For more precise measurements, look for the smaller divisions between the centimeter marks, which usually indicate millimeters. To measure, align the object with the ruler's edge, and read the value at the point where the object ends.
A tyrant
2.5cm
by the numbers that are marked there
Stright edge
The numbers are to the left of the inch markers.
inches, centimeters and millimeters
It is often called a straight-edge.
A length of two units!
They both have numbers.
The one with shorter distances between the numbers.
Probably centimetres.
measure it with a ruler if there arent any numbers...
It could be a ruler. Just a number line.