Not really. There are 20ml, 40ml, 60ml,80ml and 100ml markings on it.

It's just that it won't be accurate

Depends on the beaker though.

And in some cases, the readings might be absent or “scratched off”.

One of my student’s calculator was scratched off so badly that the “digits” on the display become missing.

I had to “guess” by memory where the placement of the digits on that Casio fx 96 sg calculator were on.

That's funny.

We have a theoretical question here so quite obviously the beaker' markings are taken to be intact. We are also looking at a typical standard 100 ml beaker, where these markings are the standard.

If quality of measuring instruments have to be taken into consideration then the stopwatch and electronic balances' displays come into question as well.

i.e digits not displaying, blurred, screen cracked, liquid inside caused a smudge

Clearly that is not the point of the question.

Hehe.
It is ok. Beakers can have marking or no marking too. We may also say maybe there is one beaker giving high precision marking. Anyway, it is good to point out any point for student to think hard.