Fisher Space pen 🖊️

10 Thoughts on Fisher Space Pens : r/pens The Fisher Space Pen is a specialized, durable writing instrument featuring a pressurized, sealed ink cartridge designed to write in extreme conditions: zero gravity, underwater, over grease, upside down, and in temperatures ranging from -30 ). Used by NASA since 1968, it uses thixotropic ink that lasts three times longer than standard pens. Fisher Space Pen Fisher Space Pen +5 Key Features and Description: Technology: Uses a tungsten carbide ballpoint and a pressurized ink reservoir (typically the PR4 refill) to ensure consistent ink flow without relying on gravity. Versatility: Capable of writing at any angle and on various surfaces, including wet, greasy, or glossy paper. Design: The iconic "Bullet" model is compact (about 3.9 inches closed) for pocket carry and becomes a full-sized pen when the cap is posted. Durability: Features a 100-year estimated ink shelf life and is constructed with high-quality, durable materials. Common Models: Bullet Space Pen (matte black, chrome), AG7 Astronaut Pen (the original), and various specialized, personalized, and, tactical, or, industrial models.

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