Product Description:

Watch light energy come alive right in front of your eyes! No batteries or electricity needed!  It's the spear powered by the sun! When light strikes the veins it transfers heat to each one, but not to the same degree. The light wing reflect the rays and the darker wing absorbs the rays. The stronger the light the more energy there is to heat up the darker side causing the wings to spin faster.

Features & Specifications:
  • Sunlight spin this radiometer's 4 veins.
  • The stronger the light the faster they spin.
  • Vacuum sealed globe on a durable plastic base.
  • Explore light and physics.
  • Measures: W: 3.5" H: 5" D: 3.5"
  • Weight: 10oz
  
Payment:

All buy it now purchase required immediately payment via Papal. All orders within California state will be charged sales tax. 

Shipping & Handling:

Your orders generally will be shipped within 24 hours, and you will receive a confirmation via email. You will also receive tracking information once it is dispatched.

Return Policy:

We guarantee your can be returned for a replacement within 14 days of receipt. We granted refund for defective items due to manufacturing error only.  We make sure that you are completely satisfied with your purchase. Buyer pays for return shipping on all exchange.