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I researched microscopes for a month before settling on the Discovery as a birthday present for my grandson. My primary complaint is that the 40x (400x with eyepiece) came with an internal flaw which should have been caught in quality control. The packaging of the contents was also so buried in sticky tape that I suspect it may have been a repack. I'm awaiting an RMA as I write this.Design-wise, the upper stage illumination is via a fixed acrylic light pipe which works beautifully with the 40x and 100x combined objectives. The 40x and 100x imaging couldn't be better. When the 400x objective is in place, however, the lens barrel blocks almost all the light, making it nearly useless as a light source. Under-stage illumination is excellent.
Structurally, the microscope is first-rate, ideal for an 8-year-old boy. Controls are big and bold and it seems damage-proof, one of the reasons I chose it. However, the accompanying instructions are aimed at a far older reader, are superficial, and are preoccupied with advanced concepts like staining instead of the very basics (simple things that are fun to look at-house dust, salt). The token sample slides are of herbal and wood cells, a neural cell, and, of all things, mummy wrap, all subjects far beyond the interests or understanding of 8-year-old boys, who, in this age of diminishing attention spans, want something that can be comprehended intuitively, set up immediately, with a high WOW! factor, and instructions and peripheral materials aimed at a second-grader. But vials of methyl blue and gum media?
I'm also curious as to why this product is considered a "toy," when the manufacturer's description indicates a more sophisticated instrument intended as an introduction to scientific research and exploration, which it would be but for the defect and other drawbacks mentioned above.
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