Top critical review
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Not Designed by Someone Working with Rulers
on 9 October 2016
The actual rolling mechanism is very nice, and the rubber ring idea is brilliant, giving this rolling ruler a lot of traction.
However, the ruler itself is horrible. Whoever designed it quite obviously did not know the first thing about ruler design.
Let's start with the mechanical faults: There are no spacers to raise the ruler above the paper. The entire edge of the ruler is resting on and therefore scraping along the paper, doing damage if you are not careful, and at the very least does not allow for smooth movement. Also, since the entire edge rests on the paper, you cannot use this ruler with ink, as the ink will be sucked under the edge by the capillary effect, and smear.
At this point already nearly irrelevant, but the ruler is not tapered either to reduce parallactic reading errors of the scale.