I hate to criticize but these magnifiers are really cheaply made and that reflects in the price. My main gripe is that you can't fix the parallax, so your stuck eye will knock out one eyepiece or the other, but not both. I think there is a single eye version of this article and I would recommend it instead of two pieces. The focus point is almost "close-up", so LED lights are perfect for the device. This is an article warning the buyer.
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