From the Tomb of Sennedjen

This photo shows Working Tools (Plb, Lvl, Sqr) from the tomb of Sennedjem, an ancient skilled artisan living and working c. 1300 B.C. in Kemet (Egypt), during the 19th dynasty under the reign of Ramesses II. (BB)The [Kemetians] Egyptians always thought about the metaphorical meaning of things such as a balance or a level. And this associates his job as an artisan with doing right, keeping straight the same way that a balance keeps you straight. You have to be straight in your life."

"The tomb inscriptions describe Sennedjem as 'servant in the place of truth', which turned out to be a common title for the workers and the artisans who built and decorated the royal tombs in the nearby Valley of the Kings...Although Sennedjem and the others who lived in the village were not high ranking, they were certainly highly skilled in tomb building. So, probably with the help of members of his own family and of other workers from the village, Sennedjem was able to build and decorate his eternal house. Some of the tools that Sennedjem probably used during his lifetime, a cubit rod, a right angle and a plumb level, were among the many articles found in his tomb. These tools may well have been used in the construction of his tomb and that of Rameses II, the contemporary ruler of the two lands." 

--- an excerpt from "Unfolding Sennedjem's Tomb" by Hany Farid and Samir Farid