Which defect led to the 2018 recall of Precision Optics' XR-5000 research microscopes from universities and labs worldwide?

In the world of scientific equipment, quality and precision are paramount. However, even the most respected brands can face product recalls when things go wrong. In 2018, a major scientific equipment manufacturer had to recall thousands of high-end microscopes after a significant issue was discovered. This recall shook the scientific community and cost the company millions. Test your knowledge about this famous scientific product recall case that impacted research labs worldwide.

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Lead contamination in the metal housing that could leach under certain laboratory conditions
Software that occasionally inverted microscope images, potentially leading to research errors
Glass lenses that could crack and shatter when exposed to common laboratory UV light
Electrical components that overheated during extended use, causing calibration drift