Yellow glass solar radiometer, approximately 14 x 7.5 cm, designed as a simple, lowmaintenance decorative and educational device. Key benefits Visual demonstration of light energy: the internal blades begin to rotate when exposed to direct sunlight, providing an immediate, observable response to changing light conditions. Decorative and conversation piece: the bright yellow glass and compact size make it suitable for desks, windowsills, and living rooms. Easy to use and maintain: requires no batteries or wiring; place in a sunny spot and observe motion. Product features Color: Yellow Material: Glass Size: Approximately 14 x 7.5 cm Operation: Blades rotate when exposed to sunlight, illustrating the effect of light on the radiometer vanes Package contents 1 * Solar Radiometer Only the above package content, other products are not included. Practical use scenarios Office display: place on a desk or near a window to add a decorative element that also responds to natural light. Home decor: use on a living room windowsill or shelf as a subtle kinetic accent that moves with sunlight. Educational demonstration: suitable for simple classroom or home experiments to show the interaction between light and the radiometer vanes. Additional notes Light reflection and different displays may cause the color of the item in the picture to differ slightly from the real product. Measurement allowed error is +/ 13cm.