Fisher Space Pen SPR3 kuulakärkikynän vaihtopatruuna, keskipaksu kärki, vihreä muste

Unlike ordinary ballpoint refills that rely on gravity and fail in extreme conditions, the Fisher Space Pen SPR3 refill uses a sealed, pressurized thixotropic ink cartridge. This design allows it to write at any angle—even upside down—underwater, over grease, and in temperatures from -34°C to 121°C. The medium point lays down a clean green line with fast drying and high smudge resistance.

Highlights

• Pressurized thixotropic ink writes in zero gravity, underwater, and on wet or greasy surfaces
• Medium point (M) for balanced line width
• Green ink for vivid, legible writing
• Operating temperature range: -34°C to 121°C
• Metal (brass) body for durability
• Fits all Fisher Space Pen models and other pens accepting SPR series refills

In daily use

Swap this refill into your Fisher Space Pen Bullet, Cap-O-Matic, AG7, or any compatible pen. The pressurized cartridge ensures consistent ink flow from the first stroke to the last, whether you're jotting notes in a notebook, filling out forms outdoors in winter, or writing on a vertical surface. The fast-drying green ink resists smudging and fading, keeping your writing crisp for years.

Full specifications

• Product Type: Pen Refill
• Refill Type: Ballpoint
• Ink Color: Green
• Point Size: Medium (M)
• Ink Technology: Pressurized Thixotropic Ink
• Writing Angle: Any angle (including upside down)
• Operating Temperature Range: -34°C to 121°C (-30°F to 250°F)
• Underwater Writing: Yes
• Writing on Greasy Surfaces: Yes
• Writing on Wet Surfaces: Yes
• Gravity Independent: Yes
• Compatibility: Fisher Space Pens (e.g., Bullet, Cap-O-Matic, AG7) and other pens accepting Fisher SPR series refills
• Refill Body Material: Metal (Brass)
• Quantity Per Pack: 1
• Model Series: SPR Series
• Ink Drying Time: Fast
• Smudge Resistance: High
• Fade Resistance: High
• Shelf Life: Long (sealed)
• Origin: Made in USA

Final note

One refill, endless reliability—from the depths of the ocean to the vacuum of space.