This is a bullshit argument. They do read your heart rate. But they explicitly say that it isn&#x27;t up to a medical or diagnostic level of reliability.<p>Everything has some level of quality or tolerance expected. Car parts break all the time, it is just a normal part of owning a car. You don&#x27;t get to sue a car company when your battery dies and you need a jump. You only get to do it when there is a significant or dangerous breach in the guarantees that they actually made, even if only made implicitly. Fitbit explicitly does not rate themselves for that purpose.