Metric Scale Ruler Online (mm, cm, km)
Variable Scale Ruler. This is an online scale ruler that could be calibrated to actual size and the scale ratio is variable that could be set by yourself, you can set the scale ratio according to your needs, eg. 1:50, 1:75, 1:100, 1:250, 1:500 ...etc. scale with metric units, centimeters(cm), meters(m) and kilometers(km).In order to let get you the most accurate measurement the length, we ...
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