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30-day refund/replacement
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Availability:
In Stock.
Arrives
Tuesday, Jun 3
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Features
- How it works - The glass Radiometer is made of a vacuum glass bulb. There is a rotating shaft and four blades inside. When it is exposed to sunlight, artificial light, or infrared radiation, its leaves will rotate. The stronger the light, the faster it rotates.
- Exquisitely designed - Handmade from high-quality glass. Crystal clear, small and exquisite. It needs to be placed on a flat surface to prevent shattering.
- The best decoration - It is suitable for occasions such as offices, living rooms, bedrooms, classrooms, study rooms, parties, etc. Place it on a desktop or windowsill, and as long as there is sufficient light, it can rotate continuously without requiring any other energy.
- Creative Gift - Giving it as a gift to our family, friends, colleagues, and leaders is perfect. As long as there is light, it can rotate continuously, just like our emotions. As long as we treat them sincerely, friendship can be eternal.
- Physics teaching tools - their formation can explain many physics principles. For example, the principle of refraction of light, the principle of air friction, the principle of vacuum propagation of light, the principle of uneven heating generating power, and so on.
Product Dimensions: 6.3 x 4.09 x 4.02 inches
Item Weight: 3.52 ounces
Country of Origin: China
Manufacturer recommended age: 15 years and up
Is Discontinued By Manufacturer: No
Manufacturer: DORAMI
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Tuesday, Jun 3
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
I purchase these raidometers as gifts. Before issuing them i test them for rate of spin. I have a very good working model and that is the base sample for rate of spin from a given level of light. I recently received a unit that did not meet standard and will return it. In all, I must have bought at least 15 of these units and only two were returned. In bright sunlight they should spin like crazy. If they are making 60 RPM in brught sunllight I consider that poor quality control. I will continue to purchase these units because they are well built but maybe it is the level of vacuum or the one point bearing and excessive resistnce that is at fault. Overall I do like this unit but will not hesitate to return a poorly performing unit. Update: The unit that works ell spins clockwise when viewed from the top. The recent purchase units that were returned are spinning counter clockwise. The construction is good but minor flaws are acceptable. It is the rate of spin that is the issue. If they spin slowly, or not at all, I return for replacement. Slow is 60 RPM or less in direct sunlight. The unit that works well must be spinning aboout 200 RPM, maybe 300. One looks sick and the other is performing at the Olympicc level.
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Reviewed in the United States on October 23, 2024 by eieio
I often look at this object on my kitchen window-sill, and like it when it "comes alive."
Reviewed in the United States on February 1, 2025 by P. Spalart
It’s sitting in bright sunlight but there is no spinning indoors. Just a little wobbling. I took it outside, and it spun like a top. Very cool gadget. Guess my thermal windows are working well 😁
Reviewed in the United States on June 27, 2024 by Mel Mel
Cool toy. I’d buy again
Reviewed in the United States on March 15, 2025 by MRC
The media could not be loaded. This thing does not work !!! I have two of them (previous purchased elsewhere) and this one, and it just sits there doing nothing !!!!
Reviewed in the United States on March 17, 2025 by TheRyanRanch
As other reviewers have noted, the radiometer arrived with some of the black paint flaking off one of the vanes. The rotor is also out of balance so it wobbles at high speed when n direct sunlight but compared to one I got in Germany about 8 years ago, it spins a lot faster.
Reviewed in the United States on March 14, 2025 by Sea Eben
Pushed by photons (light)? - No. Hint: Photons have no mass, therefore no "push" effect. Those little photons do possess energy though. So, intelligent people would ask, "So what does push the vanes?". Ans: The globe is almost a vacuum so there is a very small amount of gas inside. The rotating force comes from that gas being heated by infrared radiation (you can put something hot near the radiometer and it will spin with no visible light) with the black side of the vanes absorbing more energy and becoming being hotter than the white or silver side. I will not go into detail here, but the hotter gas is repelled off of the black side which creates a slight positive pressure, and the gas from the cooler white side migrates over the edge to the black side (creating a slight negative pressure on the light side) and replaces the escaping hot gas from the black side increasing the pressure slightly there. Most of this action occurs right near the edges of the vanes. Therefore, more pressure develops on the Black compared to the Silver side! Got it? Whew! Don't feel bad if you didn't figure this out. It took several great physicists many years to figure this thing out (including Einstein). OK, not 100% correct? You physics experts can correct my explanation. Thank You
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Reviewed in the United States on May 19, 2024 by Phils Stuff
I bought this for my hubby. I don’t know anything about it. He likes it.
Reviewed in the United States on January 6, 2025 by Voncille Carlson