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Smart Ruler / Ruler

Smart  Ruler

Usually, ruler’s base scale are 5mm and 1cm.
The calculation will be very hard when the people need reuse the fixed scale to mark.
Changeable ruler can fix this problem very well. Move the scale ruler and chose the scale you need,
then you can mark the same distance many times.


Shengyang Aerosapace University

Shengyang Aerosapace University
Shenyang, China