@Rongwrong My top 3:

1. Pentel Sharp Kerry Mechanical Pencil - 0.5 mm - Red Body. The metal body looks and feels like something out of The Jetsons. The cap snaps with a most satisfying click when posted (and you can still advance the lead even while posted). Red so that I can find it easily. A+
2. Zebra DelGuard Mechanical Pencil - 0.5 mm - Blue. Has the best anti-snap technology of any I’ve tried. But it’s plastic and doesn’t come in red.
3. Zebra Sarasa 4 Color 0.5 mm Gel Multi Pen + 0.5 mm Pencil - Black. If there is only one I pen/pencil I could take with me, it would be this giant. Not the best at anything, but good–great overall (though for people with smaller hands its size may be an issue).