There is no reason not to have a microscope. A small hand held one is $10 from Radio Shack. To be honest... it's cool as hell to look at the leaves under the scope. My plants are still weeks away from harvest but I use the scope on them weekly to check the leaves for any infestation and just to look at the developing resin.
Every grower should have a microscope... $10 is totally reasonable. 
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