what it is useful is common sense.
in engineering, which you can apply here, you find the factor of safety (range) which something works in so it doesnt fail.
Error measn the difference between the difference between the measured value and the true value.
The precision of a measuring device is the smallest uni marked on that device.
The accuracy of a measuremnt is how correct or true that measurement is.
The absolute error of a measurement is the greatest possible error or 'the furthest by which you can be wrong.' It is equal to half the precision of the measuring device.
The limits of accuracy refer to the upper and lower values between which a measurement can lie.
Percentage error= absolute error divided by measurement times 100%