Metric Screw Gauge/Ruler
thingiverse
Combined Metric Screw Gauge by AngelLM (https://www.thingiverse.com/thing:1964179) and modified Simple Pocket Ruler by ManisTech (https://www.thingiverse.com/thing:2888636) come together perfectly to create a handy gauge/ruler for easily sorting metric screws. To enhance readability, simply take a Sharpie and mark the raised lettering.
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