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Our Clear Sphere Radiometer, also known as a light windmill, demonstrates a scientific theory: converting light into energy. Crafted of hand-blown glass and metal in Germany, this radiometer will spin 2,000 revolutions per minute in warm light, such as sunlight and well-lit rooms. It will not spin using fluorescent lights. For all the science buffs on your gift list, this radiometer is truly one of a kind.
• Clear Sphere Radiometer • Converts light into energy • Crafted of hand-blown glass and metal in Germany • Will spin 2,000 revolutions per minute in warm light • Does not spin in florescent lighting • Ideal gift for science buffs
