'Plummet' in the Bible

This is what he showed me: Behold, my Lord [was] standing beside a wall [built with] a plummet, and a plummet [was] in his hand.

And Yahweh said to me, "What do you see?" And I said, "A plummet." And my Lord said, "Look, I [am] going to set a plummet in the midst of my people, Israel. I will not pass them by again.