Yes, a jeweler's loupe is great and quite inexpensive -- you can get them at Amazon.com. You don't need more than 10X; in fact I think one of the lower ones 4X to 6X is better and they can be less than $10 as I recall. (I have one that gives me 3 choices, but you don't need that) It can make all the difference in deciding what is eating a plant, or one of those "no-see-ums" crawling around eating roots in the dirt...
