The choice of executives, the Fisher X750 Space Pen has a comfortable rubber grip and compact design. Originally designed for use on space flights, this pressurized space pen writes in freezing cold (-30°F), boiling heat (+300°F), the gravity-free vacuum of space, underwater, over most grease, and even upside down. NASA, after rigorous testing, selected the Fisher Space Pen for use on all of the Apollo missions. They are still used on all American and Russian manned space flights.
I gave this to my boyfriend for our anniversary. He LOVED it! He really likes how it can write upside down and underwater. He loves cool gadgets like this. And I got points for being a great gift giver.