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A tape measure.
You take a ruler or tape measure and measure the dimensions you need.
cm,m If you're measuring something not really large, then use a tape measure. If it's something large, use a laser. If you don't have a laser, then set aside adequate time and get friends to help with the task.
Lengths - in units that are marked on the tape measure.
-- ruler -- tape measure -- meter stick -- yardstick -- car's odometer -- laser rangefinder -- split-image rangefinder