Well,
Since you asked,(it is quite obvious to most people),
here is a simple way to deal with these kind of linear scales:
Each CM(biggest bars) is divided into 10 equally spaced smaller bars with one medium sized one in the middle.
It should be interpreted like so:
Each small bar is 1/10 of a CM (0.1CM).
The mid bar is 0.5CM.
That would work for all types of linear scales.
People used to CM scales take that(decimal system 1/10) to be an obvious thing.
When they switch to Inches they have a problem understanding the power of 2 system(1/2,1/4 1/8,1/16 etc.)
Isn't it about time to throw away that ridiculous inch system ?
Who in the world still uses it ,(USA and...)?
Apart from the difficulty of switching ,why ?