Use the power of the sun to drive the vanes in this traditional radiometer. Place on a windowsill or in an area that has sunlight and solar energy will create energy to work the radiometer. Made in the USA. Read more...

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Use the power of the sun to drive the vanes in this traditional radiometer. Place on a windowsill or in an area that has sunlight and solar energy will create energy to work the radiometer. Made in the USA.