Do you?
A micrometer I mean.
In the first place, do you know what micrometers are?
They are precision measuring devices for measuring lengths. I supposed in our everyday lives, we do not really need such precision. However, precision is important in industries. For example, how do we know that the electrical cables are 1.11 mm thick and not 1.05 mm? Can you measure such difference with a normal ruler? You can't!
But you can with a micrometer.
So if you need such precision, do go get a micrometer from the hardware store!
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