This website collects product IDs of Casio Prizm calculators, so that the community of users and developers of these calculators can get an idea of how many of these calculators exist, how many are typically produced per month (and whether they are always in production, or if only on certain months), whether the rate of production has been increasing or decreasing, etc.
Depending on how much additional information people enter along with the product IDs, it may be possible to take more useful information out of the data, like how many calculators were produced with a certain OS version preloaded or contain hardware of a certain revision, how long it takes on average for a calculator to be bought after production, and how batches are distributed between countries.