Unit cminch
Want the most accurate online ruler in Internet? Just 2 step:

>> Firstly, select a handy object in the top menu...
>> Place on screen at proper position,use the  <<  <  >  >>  buttons to adjust the size of picture until the object and the picture have the same width

Calibration is finished. Now you can use the ruler!
You calibrated the ruler in earlier visit. Now you can use it directly.

Please re-calibrate the ruler after changing monitor / adjusting resolution / rooming page.
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