The Fisher Space Pen Difference

Unlike ordinary ballpoint pens which rely on gravity to feed ink, the Fisher Space Pen’s replaceable cartridge is pressurised.

Ink is continuously fed to the tungsten carbide ball, allowing the user to write at any angle, even upside down. This advancement required the development of a special visco-elastic ink, with consistency similar to thick rubber cement. The ink flows as a result of the shearing action of the rolling ball in its socket, which liquefies the solid gel thixotropic ink, allowing the pen to write smoothly and dependably on most surfaces and even under water.

Evaporation, waste ink and back leakage are eliminated. Ink will not dry out for over 100 years! Writes at any angle at temperatures of -35°C to +121°C.