Seen on the site alibaba dot com & the person that makes them is in Indonesia. Gives name of person & company, address, phone number, prices & minimum order requirements.
Many other counterfeit detectors are available if anyone orders them. The large minumum qty per model seems to indicate they aren't manufactured until after the money is received. So not all models listed may have been produced yet. The minimum order is something like 50-100 identical units, so $15,000-20,000++ per model.
There was someone on eBay a few months ago doing 1 day auctions, it seemed, with 50 or more listed starting at well under $100 & it didn't say reserve not met but I scrolled down & it said he couldn't honor the bids, only buy it now for something like $1,700. This was when factory & dealers could not provide them due to the African gold rush. I haven't gone back to alibaba to see if the ad is still there, but those eBay ads are gone. Best wishes, George (MN)