UV Blacklight Reactive Lava Wave Machine -- Gadgetify
Here is a wave machine that puts on a relaxing show when you expose it to UV blacklight. This Lava Wave Machine features smooth movement and built-in wave sounds. The vessel measures 16 inches long. Non-UV reactive versions of this are also available.
More gadgets like this: here
These wave machines are rare but show up once in a while on eBay.
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