What size would be the equivalent to 0.05 pens? Im looking for a really fine white pen. We need to buy the ink separately, correct?

Hello! the isograph makes the thickness of the line equivalent to the metric system (mm). if you compare a ballpoint pen, it is usually 0.5-0.7 mm. isograph the line thickness is from 0.1 and above. Liquid Ink 23 ml are sold separately for refueling and are not included in the purchase.

Are the isographs as horrible as the old rapidographs? i use the .13 rotring cartridge pen a lot. and now you can't find nibs anywhere on earth. help!

I have the Rotring .1 and .2 Isograph and I am thrilled with them. I kept avoiding for a long time because of the reputation of rapidograph. These are great. I feel like I have so much more control when drawing. Just use the right ink and don’t press too hard.

the color for this product is mentioned as Brown. do they mean the ink color or the outer pen color which is in brown ?

You can use any color bottled ink of your choice..Brown is just the color of the pen.

how do I get the ink to flow?

Hi Sue , this is Ivana from rOtring Consumer Care. Thank you for contacting us regarding our rOtring 1903394 Isograph Technical Drawing Pen. Before the first use and during the ink refilling the pen must be shaken lightly to encourage the ink to flow to the tip.

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✏️ Draw the future with precision and style!

COLOR CODED EFFICIENCY - Instantly identify your line width with the smart color-coded barrel.
EFFORTLESS MAINTENANCE - Push-on sleeve design allows quick ink access and fast cleaning.
SUSTAINABLE CREATIVITY - Refillable ink reservoir keeps your workflow uninterrupted and eco-friendly.
DURABILITY MEETS DESIGN - Hard chrome plating ensures long-lasting wear resistance for professional use.
PINPOINT PRECISION MASTERY - Achieve flawless detail with the ultra-fine 0.1 mm stainless steel tip.

The rOtring 1903394 Isograph Technical Drawing Pen features an ultra-fine 0.1 mm stainless steel nib with hard chrome plating for exceptional durability and precision. Its refillable ink reservoir supports sustainable, frequent use, while the push-on sleeve enables easy cleaning. Available in 13 line widths with color-coded barrels, this pen is engineered for professionals demanding flawless technical detail.

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Manufacturer	Sanford
Brand	Rotring
Model number	1903394
Product Dimensions	14.2 x 3.99 x 2.2 cm; 19.05 g
Color	Brown
Closure	Snap
Grip Type	Plain
Pencil Lead Degree (Hardness)	H
Material Type	Stainless Steel
Number of Drawers	3
Number of Items	1
Size	0.10 mm
Point Type	Ultra Fine
Line Size	0_1mm
Ink Color	ブラック
Manufacturer Part Number	1903394
Item Weight	19 g

rOtring 1903394 Isograph Technical Drawing Pen, 0.1 mm

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