'Measuring rod' in the Bible

He brought me there, and I saw a man whose appearance was like bronze, with a linen cord and a measuring rod in his hand. He was standing by the gate.

Now there was a wall surrounding the outside of the temple. The measuring rod in the man’s hand was six units of 21 inches; each unit was the standard length plus three inches. He measured the thickness of the wall structure; it was about 10 feet, and its height was the same.

He measured the east side with a measuring rod;it was 875 feet by the measuring rod.

He measured the north side;it was 875 feet by the measuring rod.

He measured the south side;it was 875 feet by the measuring rod.

Then he turned to the west sideand measured 875 feet by the measuring rod.