Clear Solar Power Radiometer Handmade Glass Crookes Radiometer for Home, Desk, and Classroom A clear glass radiometer that converts sunlight into visible motion. This handmade Crookes style device contains a set of black and white vanes inside a glass bulb. When placed in direct sunlight, the vanes rotate, providing a simple and attractive demonstration of light producing motion. Key benefits Educational demonstration: Visually illustrates how light energy can produce motion, useful for physics lessons and hands on learning. Decorative and engaging: A minimalist glass piece that adds motion and interest to a desk, windowsill, or living room display. Handmade quality: Carefully made from glass for a clean, transparent look that highlights the internal vanes. Compact size: Small and easy to place in many indoor settings. Product details Material: Glass Size: 13 cm (approximately 5.1 in) Operation: Place the radiometer in direct sunlight and the vanes will rotate Age recommendation: Suitable for children aged 14 and older due to fragile glass construction Package includes: 1x Solar Power Radiometer Note: Glass is fragile. Handle with care. Use scenarios Classroom demonstration: Use on a sunny day to show students the conversion of light into motion and spark discussion about energy and physics principles. Desk or office accent: Place on a desk near a window to add a dynamic, calming element that moves with the sun. Gift or display: A compact, handmade piece suitable as a thoughtful gift for someone interested in science or for a decorative addition to a living room or study. Additional information Please allow a 1 to 3 cm measurement variance due to manual measurement. Colors and appearance may vary slightly from photos because of monitor differences. Keep out of reach of young children and store safely when not in use.