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When we use a ruler to draw successive line segments, in order to define where the next segment should end, there is always a need to relocate the 0 scale on the ruler, or to calculate the total line length.
By using the Movable Graduation Ruler, we can easily measure the next line segments by just moving the scale piece to the end of the previous segment.
It also avoids the inaccuracy caused by ruler removing when measuring line segments or graphics.
With the movable graduation ruler, even children and the elderly can easily and accurately draw line segments or measure the length without calculation.