The Fisher Bullet Space Pen from Vat19 is essentially a “ballpoint pen that will write upside down, underwater, over grease, and in extreme cold and hot temperatures — has an estimated shelf life of 100 years.” Product page. Video after the break.

After rigorous testing, in 1967, NASA selected the Fisher Space Pen for use on the Apollo Missions. They are now used on all manned space flights – American and Russian.

[via Vat19]