A line of flax... a measuring reed. — The former for the longer, the latter for the shorter measures, a characteristic definiteness in details.
Related Commentaries of Ezekiel 40:3
Ezekiel 40:3
3 And he brought me thither, and, behold, there was a man, whose appearance was like the appearance of brass, with a line of flax in his hand, and a measuring reed; and he stood in the gate.