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It is in principle the same instrument that is used today. The simplest version consists of two arms, connected at a right angle with pegs or with tongue and groove.There may also have been squares with a third piece of wood connecting the two legs in the shape of an A, similar to the square levels.
The measurements indicated consist of the 7 palms and digits and their subdivisions.
Lepsius collected information about fourteen more or less complete cubits.
Most of these examples were not actually used as tools, but as votives, or were made for the funerary equipment and therefore made of hard stone.
Apparently, stonemasons also used another measuring unit, the nby-rod, which might have been about 67 to 68 centimeters long, subdivided into seven spaces.
Unfortunately, there is not much evidence for its application and exact dimension.