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A ruler made of stainless steel.
I have steel rules that are marked down to 1/64 of an inch.
The steel rule is a measuring device. It is used to measure a piece of work such as engineering and is usually used just as if it were nothing more than a regular ruler.
To measure distance from 0 to about 30 feet.
A flexible steel rule, spring assisted, that coils to its own case after use