Device that’s often 12 inches long

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Possible Answers:

Ruler.

Last seen on: Daily Celebrity Crossword – 6/5/19 Wayback Wednesday

Random information on the term “Ruler”:

Precision is a description of random errors, a measure of statistical variability.

Accuracy has two definitions:

In simplest terms, given a set of data points from repeated measurements of the same quantity, the set can be said to be precise if the values are close to each other, while the set can be said to be accurate if their average is close to the true value of the quantity being measured. In the first, more common definition above, the two concepts are independent of each other, so a particular set of data can be said to be either accurate, or precise, or both, or neither.

In the fields of science and engineering, the accuracy of a measurement system is the degree of closeness of measurements of a quantity to that quantity’s true value. The precision of a measurement system, related to reproducibility and repeatability, is the degree to which repeated measurements under unchanged conditions show the same results. Although the two words precision and accuracy can be synonymous in colloquial use, they are deliberately contrasted in the context of the scientific method.

Ruler on Wikipedia