This is a gorilla glue auto by Growers Choice, it is 3 weeks old and I just noticed these spots, I have a second plant of the same strain that does not have spots.
Doesn’t QUITE look like pests IMO. Did you by any chance spray a few droplets of water on the leaves recently? Also; how are you monitoring your PH as it could be a PH issue.
I have looked at underside but not with microscope, I will do that when I get home. could have gotten water on them, ph on water is 6.5.
half leaf could be from dropping this plant once while moving too many at once.
2nd identical plant not showing anything. here is pic of 2nd plant