As we come to Revelation 11 he is told to get out his measuring stick in verses 1–2 and measure the temple.
Let’s read about it in Revelation 11:1-2.
“Then I was given a reed like a measuring rod. And the angel stood, saying, “Rise and measure the temple of God, the altar, and those who worship there. Sometimes in the Old Testament, the idea of measuring communicates ownership, protection, and preservation. When this temple is measured, it shows that God knows its every dimension, and He is in charge. But leave out the court which is outside the temple, and do not measure it, for it has been given to the Gentiles. And they will tread the holy city underfoot for forty-two months.”