How to cite a physical product? Assume I’m writing a paper about randomness.  I might have this text:

Traditional TRNGs are (typically) external add on devices of varying size, cost and complexity [11][12][13].

How would I cite three specific examples such as:


TrueRNG v3 – Hardware Random Number Generator selling for ≈£50

Quantis Random Number Generator selling for £1100

Dice-O-Matic accessed 25/11/2017 which is a DIY toy device



Are these even products, or are they just web sites?  What if the referenced product was a Ferrari sports car instead?  There are a few product citation-style questions showing up in the Similar Questions box, but they tend to be for software.  Is there a difference?
Note that I'm not asking a philosophical question, rather a formatting one.  What do I actually type for each reference?  What would you type if you were going to add a reference for say the TrueRNG?
In the example given, you are citing the specification, not the device.  The same is true of the Ferrari.  You are going to say something(s) about it, such as horsepower or wheelbase.  So, find and cite the specification(s) needed.

Edit: For the TrueRNG, you cite the web page, if that's the best information available, using whatever your discipline's citation style requires for a web page.  You're still citing the source of the information, not the physical object.

If you actually examine a physical product, e.g. reverse-engineer TrueRNG, then you describe the object you examined and the findings of your examination.  So, "I disassembled TrueRNG model ABC, serial number XYZ, and measured the actual entropy generated by the frammistan module using Someone's Method and determined..."  Similarly if you measure the acceleration of that Ferrari.  (I don't think that's the question you're asking, but that's what the title implies.)