I bought this to check plants for spider mites, diseases etc. I have 15/20 PRK vision correction with no problems. The thing is useless, the glass is so small you can barely see it, and besides, at 60x magnification, it's almost impossible to stop where you want to see without walking past it a dozen times. When you get where you want to be you have a lot of visual distortion because it's 60x and so small. If it was 2.5-3 times bigger it would be great. Now the lights are working properly.
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