it measures the length or distance
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it is used to measure things
Use a trundle wheel or odometer
The Trundle wheel is a measuring device used to find the distance from one location to another. The trundle wheel is made up of a wheel (usually with the circumference of one metre), a handle which is attached to the axle of the wheel, and a device which "clicks" every time the wheel makes one complete turn.
a Trundle bed
To measure the length of a hallway, you would typically use a measuring tool such as a tape measure or a measuring wheel. Start at one end of the hallway and extend the measuring tool to the other end, ensuring it is straight and taut for an accurate measurement. Record the measurement in the appropriate units, such as feet or meters, to determine the length of the hallway.