I carry a sharpie and a streamlight pen light daily. Anything larger than the streamlight sucks to carry and is too bright for actual "inspection" of things up close or in holes.
Anyway, my contribution is the dual tip BLUE sharpie. Nothing else compares. Through some form of magic not only does the blue ink show on everything, it outlasts every other color by easily 20x. I carry them for months until the clip dies. So if you go through a lot of sharpies, order a blue one. You'll only need one.
