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there are many instruments used to measure length . measuring tape is used to measure the length of room.
That depends what you want to measure about the room: for example its temperature, its color, etc.
You wold measure how tall a room is by using a meter stick or in any form of units.
Measure the length and width of the room in meters. Multiply the length x width to get the area in square meters.
Measure the area on the plan and multiply by the square of the scale.