How noticable are Spider Mite?

Ive read loads of posts on here and looked through loads of pics . Its looks like i have spider mite as i have symptons BUT i havent found any of the mites. So i wanted to know from someone that may know.......... How carfully do you have to look at the plant to find any?

Ive already tried a spray thats soposed to sort spider mites and other flies out..

I have some kush plants that look like they have mites too, but it's just the strain sometimes. Look at the undersides of the leaves. They're hard to see with your eyes, but if you can't see them yet you don't have too much to worry about. Also, lay off the spider mite spray unless you have a confirmed infestation. Those sprays are really really toxic....