The words on the urine strips are
+/- is traces
+ is faible
++ is moyen
+++ and ++++ are fort
So I think that means probably up to + is normal, ++ is medium and +++ is high. And if they’re high and you don’t know why, or feel ill, or have high bg, then you need to keep checking / seek help? Not sure about if it’s a concern if they’re ++, imagine need to at least keep an eye on which way it’s going.
Having barely ever used ketone strips before, I also noticed that the pack says you must throw away after 6 months of opening. I have used quite a lot this week but doubt I’d ever get through a whole pot of 50 in 6 months!