RotringIsograph Technical Pen, 0.30 mm

Old and devoted Rotring user from 1980

These are much better at keeping the ink from drying out than other brands that I've tried. I have 2 sizes now and probably will order another one.

I used the Koh-i-noor brand for years, and went back to dip pens because they were so unreliable. The Alvin pens are superior, but very hard to find. Microns, in my experience, are ridiculously expensive, and often run out of ink during the first or second use. People probably use them because the other brand of tech pen popular in the U.S. is way too much trouble. I tried one of these, and now have four. They are easy to use, clean, and, as long as Rotring ink is used, they do not clog, even after several days of lying unused. The Koh-i-noor pens seemed to clog if I looked at them too hard. I have the .2, .25, .3, and .4. I DO NOT recommend using regular ink, even good ink, that is not designed for these pens. My favorite black ink is Dr. Ph. Martin's Bombay ink, but I DO NOT use it in these pens. It WILL clog them, even though the label indicates it can be used in technical pens. Other than being held hostage by the Rotring ink, I cannot think of a downside to using these instruments. Great product.

Gut

En pocos días se rompio la parte de recarga. Lo que aguanta la aguja... una pena. No me duro ni un mes. Todos estos materiales son fabricaciones antiguas y materiales caducados. Me sabe mal. Y siguen sin gustarme los rotuladores finos ...