verses is used indicates that the plummet or level was used with great accuracy. If they were not

the Lord would not have compared their use with justice and righteousness. God's justice is

perfect, his righteousness is without fault. The Hebrew word "ebhen bedhil" is used in the

following verse in a similar manner to the previous two verses, verifying the accuracy with

which the plumb-line was used in the construction of the temple under Zerubbabel's leadership.

 For who has despised the day of small things? But these seven will be glad when they see
 the plumb line (or plummet in the KJV) in the hand of Zerubbabel--{these are} the eyes of
 the LORD which range to and fro throughout the earth (Zechariah 4:10 NASB).

In reference to this verse, Matthew Henry (1996) says:

 Those that despaired of the finishing of the work shall rejoice when they see the plummet
 in the hand of Zerubbabel, when they see him busy among the builders, giving orders and
 directions what to do, and taking care that the work be done with great exactness, that it
 may be both fine and firm. Note, it is matter of great rejoicing to all good people to see
 magistrates careful and active for the edifying of the house of God, to see the plummet in
 the hand of those who have power to do much, if they have but a heart according to it; we
 see not Zerubbabel with the trowel in his hand (that is left to the workmen, the ministers),
 but we see him with the plummet in his hand, and it is no disparagement, but an honor to
 him. Magistrates are to inspect ministers' work, and to speak comfortably to the Levites
 that do their duty." Those seven eyes that run through the earth are all upon the stone that
 Zerubbabel is laying straight with his plummet, to see that it be well laid. And those that
 have the plummet in their hand must look up to those eyes of the Lord, must have a
 constant regard to divine Providence, and act in dependence upon its guidance and
 submission to its disposals

 Matthew Henry eloquently points out that Zerubbabel was motivated to accurately layout

the house of the living God. The human eye is not accurate enough to level walls; therefore the

ancients were dependent upon the tools available. The tool used to accomplish the leveling was

the plumb-line or plummet. This tool in the hands of the right person was adequate in ancient

times to level walls with accuracy.

Measuring Line, Rod and Compass

 {Another} shapes wood, he extends a measuring line; he outlines it with red chalk. He
 works it with planes and outlines it with a compass, and makes it like the form of a man,
 like the beauty of man, so that it may sit in a house (Isaiah 44:13 NASB).