According to Wikipedia, something is a medical device if (among other things) it's used for the prevention of disease, which is a completely reasonable definiti

According to Wikipedia, something is a medical device if (among other things) it's used for the prevention of disease, which is a completely reasonable definition. Just because the government isn't doing its job doesn't mean I'm wrong, especially since my point was about the government not doing its job in the first place. https://en.wikipedia.org/wiki/Medical_device https://en.wikipedia.org/wiki/Medical_device I had basically the same same experience as you in terms of buying something at the supermarket that was very obviously not giving accurate results, and also just returned it and bought another one that actually works. But if someone were to not notice, the results could be potentially catastrophic, especially if the person was pregnant or had a compromised immune system.