What measurement tool has been in use since at least 2650 B.C.?

What measurement tool has been in use since at least 2650 B.C.?

Clock

Ruler

Compass

Hourglass

The ruler has a lengthy history. The oldest preserved ruler — a rod made out of copper alloy that dates back to 2650 B.C. — was discovered in Nippur, Mesopotamia (now modern-day Iraq) by a German archaeologist named Eckhard Unger. Preserved rulers have popped up in other locations, such as ivory rulers used in the Indus Valley in 1500 B.C.; it is likely that rulers made of decomposable materials, such as wood, disintegrated over time.

Answer: The correct answer is Ruler.

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