If I was getting into the level of measuring things where the temperature coefficient mattered at all, other than a standard 20C room temperature, I sure as hel

If I was getting into the level of measuring things where the temperature coefficient mattered at all, other than a standard 20C room temperature, I sure as hell wouldn't be using a $9 plastic caliper from Amazon. My point was that the ultra cheap caliper is suitable for measuring basic things where you can't get a good reading using just a steel ruler with 1mm increment measurements on it by eyeball, and maybe you might want to measure something a bit more precisely than 1mm increments. And it might be suitable for basic home DIY purposes. As I said, if I wanted a serious caliper I'd go spend $250 on one. A cheap caliper like this, for example, might be suitable to tell me if a stripped copper wire's diameter really matches 23AWG or if it is 24AWG which is hard to see by eyeball.