a ruler is something that measures the length of an object
the tool of length is a RULER!
ruler
A ruler
a ruler
ruler and pencil
ruler
Ruler.
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Ruler. Micrometers. Caliper.
It is used in a laboratory, but is not considered a laboratory tool by most people.
An angle ruler is a tool used to measuring angles like a protractor. An angle ruler is more accurate than a protractor.
Yes, "ruler" is a homograph because it has the same spelling as the word "ruler," which can refer to a measuring tool or a person in a position of authority.