Measure oil level

I have a bigger problem again: I can’t see anything in this small window to measure the oil level, but also nothing at all. There are two “limits” on the right and left, but that’s what it was. I can’t see anything from high and low level or any display. I’m worried so slowly, because I don’t know how much oil is in it and if I have to drop something. That’s just robbing me of sleep. I can’t get the filler plug turned up and worry so slowly. I’ve been screwed up.