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Sakura Micron Pen Widths
A bag of the Sakura Micron pens I was adapting for the HP 7475A plotter, before the generous donation of New Old Stock plotter pens arrived, come in a variety of useful widths:

Sakura Pens This relentlessly organized doodle happened while reading some tech docs on the Comfy Couch:

Sakura Pen Width Examples The first two lines obviously belong in their own group, but, hey, it’s a doodle.
The two Uni-Ball Kuru Toga pencils, in 0.5 and 0.7 mm, have diamond-impregnated lead that’s supposed to be much more break-resistant than usual. I fear that they’ll land point-downward and wreck the rotating sleeve surrounding the lead, so I’ve managed zero drops so far. Even I hesitated at the 0.3 mm version.