Fisher Space Pen is the utmost reliable writing instrument used by all trades. Known for being used on every crewed flight into space since Apollo 7 missions and most recently Space X, our pens write in extreme temperatures (-30 to +250), underwater, at any angle — even zero-gravity, over oil and grease, and three times longer than the average pen. Our pens are the pen of choice for any military contractor, outdoor enthusiast, trekker, angler, hunter, law enforcement, first responder, or anyone who demands reliability and dependability in their job when using a writing instrument. (less)