I mentioned this on other threads but there is a "digital microscope" that you can buy off of Ebay for $19 with free shipping that can ease your pest worries. I saw a video about this gadget on MissOrchidGirls Youtube. It magnifies things 500 times so you can see everything about your leaves. It will show mites, close up of leaf damage, ect. I found it helpful when wanting to see questionable areas on my leaves. It plugs into to your computer and you see it on your screen. You can even capture pictures or video. Well worth $19...
50 500x 2MP USB 8 LED Light Digital Microscope Endoscope Video Camera Magnifier | eBay
That is the seller I used and they shipped right away.