Uni Power Tank Ball-Point Pen 0.7mm Ink and paint refills Is the pocket format practical

Is the pocket format practical for serious plein air watercolor work

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Uni Power Tank Ball-Point Pen 0.7mm Ink and paint refills Is the pocket format practicalThe Power Tank 0. 7 mm writes in conditions that stop most pens cold straight up, overhead, on wet or glossy paper, and down to 20C because an internal air pressurization chamber pushes the ink forward instead of relying on gravity to feed it. Clicking the pen compresses air inside the chamber, keeping constant pressure on the ink regardless of the angle or temperature, which is the actual mechanism behind all of that, not just a durability claim. The