Ray box, simple, safe and sturdy source of projected light for many classic optics experiments, produces parallel convergent rays across a plane horizontal surface and the rays are intense enough to be traced in natural light. Built in solid aluminum extrusion casing, 100-240V 50/60 Hz
Blade number:20 Disposable Premiere* Blades are made of high carbon steel, individually foil wrapped and sterilized by gamma radiation. 10 per pack; 10 packs per box,For number-4 scalpel.
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