Blue glass radiometer designed for visual demonstration and decorative display. Compact and elegant, it combines smooth glass construction with a simple moving mechanism that reacts to light. Key benefits Visual indicator of light intensity: the vanes rotate when exposed to sunlight or strong indoor light, creating a steady, eyecatching motion. Decorative and functional: polished glass and blue finish make it suitable for desks, windowsills, and living spaces while providing a talking point. Compact size and solid material: made from glass, dimensions 14 x 7.5 cm offer an unobtrusive footprint that fits most home and office settings. Specifications Color: blue Material: glass Size: 14 x 7.5 cm Package contents: 1 radiometer. Only the above package content is included; other items are not included. Practical uses Office desk: place near a sunny window to add a calming, kinetic element to your workspace and indicate changing light throughout the day. Living room or shelf display: use as a decorative accent that also demonstrates lightdriven motion when sunlight reaches the vanes. Classroom or study aid: use in physics demonstrations to show a simple response to light and encourage curiosity about basic physical principles. Notes Color may vary slightly due to lighting and display differences. Measurement tolerance plus or minus 1 to 3 cm.