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  • Replaceable pressurized ink cartridge continuously feeds ink to the tungsten carbide ball, allowing pen to write at any angle--even upside down
  • Thixotropic ink writes smoothly and dependably on most surfaces, even under water, on photographs, in freezing cold, extreme heat and in space!
  • Stainless steel, precision-machined socket prevents leaks and oozing yet delivers uniform ink flow
  • Revolving ball liquefies the ink so that it writes more smoothly, more dependably and longer than most pens
  • Medium point, black ink

Made in USA.

Since 1967, Fisher Space Pens have been used by American astronauts on all manned space flights.

View all Fisher Space Pen Pens

REI membership


Best Use Multisport
Length 5.5 inches
Rated 5 out of 5 by from Nothing Special, but it's a Good Pen: There's nothing particularly exceptional about this pen, but it does exhibit solid construction and has a nice matte finish. By far the biggest attribute is the fact that it uses a Fisher Space-Pen cartridge (something that many other pens are able to claim) which allows the user to write at altitude, on nearly any surface, even under water. They are very reliable, but do have some imperfections, mostly inherent flaws of ballpoint pens including the requirement of greater writing pressure than a rollerball or fountain and having a less smooth flow. OTOH Fisher designed a better than average ballpoint (that operates in conditions that do not permit the use of a rollerball or fountain pen), so I have no complaints.
Date published: 2013-10-31
Rated 5 out of 5 by from THE Pen to own! I have many pens that use the Fisher Space Pen refill (SPR4). Some are by Fisher and some are from other companies. This cartridge is the best writing instrument in my opinion, but the outer pen is what can make or break the experience. Of all the pens that I have the Military Pen is by far the best! Slim and very professional in appearance but very durable in design. It works well at the office or on the trail. Having a writing instrument on your person is a must! I can think of none better than this particular model. The price point is awesome too! I have other pens that are four times the price I paid for this one at REI, I wish I had bought four of these instead!
Date published: 2014-09-12
Rated 5 out of 5 by from The only pen you'll ever need This pen is perfect for someone who shops at REI. I used to be able to get them on base, but I had to move and couldn't find them anymore. REI to the rescue. In any case, I have used this pen in sub-zero temps on the flightline, while SCUBA diving (it works, but just take a pencil), and in the waterproof journal I kept during a month in Thailand. It's worked perfectly in every situation. Next stop, space... Only drawback is that it's a metal pen, so if you deathgrip it and write 20 pages, it's going to leave a mark. Nice features: most waterproof paper has a waxy texture and other pens won't write on it; the whole body of the pen is metal, so you can use it as a MacGyver type tool (it works well as a prybar and box opener); one hand operation beats other Fischers; fits well in pen pockets on uniforms.
Date published: 2009-08-06
Rated 5 out of 5 by from I thINK it is so dePENdable, am I WRITE? My Grandmother gave me my first Fisher Space Pen when I was about 7 years old. It looked pretty cool, but I certainly didn't appreciate a good pen when I was that young. I kept it and used it until I lost it when I was about 15. Now, 15 years later, I bought myself a new one.. this Fisher Space Pen Military Pen. I liked the look and size of it, plus it's pretty cheap. Unfortunately I think the one I got was a lemon. I tried writing a lot, but the ink would cut out very frequently. I drew a straight line that looked like morse code. I exchanged it at REI with no problem (are there ever any problems returning/exchanging things at REI? Didn't think so..). The one I have now writes BEAUTIFULLY. Very, very smooth. No smudges. It's just a good, dependable pen. Also, the description doesn't mention this, but the pen "cap" is fixed to the pen. You twist the cap to make the point stick out for writing.
Date published: 2012-03-21
Rated 3 out of 5 by from Close, but has drawbacks The black matte finish is not grippy and the pen feels a bit too slippery for easy writing. I would choose a different Fisher model because of this. The space pen refill may write well in extreme conditions, but the drawback is that it tends to glob when it first touches the paper and can skip a bit. Under ordinary conditions, most other ball point pen cartridges are better than the Fisher space pen cartridge. I would recommend it only for extreme use.
Date published: 2008-07-16
Rated 4 out of 5 by from The HumVee of Pens These pens are built bomber tough to hold up in outdoor conditions. You can write at any angle, even upside down or up against a wall, without skipping or shaking. I have them stashed in a number of places so whenever I have to write important stuff down I have one handy. Pair this with the Write-In-The-Rain pad for a fantastically durable note and info taking set up.
Date published: 2008-11-22
Rated 5 out of 5 by from Great Pen!!! I've found that this is a very convenient pen, and it is perfectly at home in anything from a flight suit pen sleeve to the spirals of a notepad. Overall I think it is an amazing value, much more convenient to me than the bullet pen, albeit a small sacrifice on space. Five stars, amazing product. The only con is a small blob of ink after you haven't written anything for a while. This is due to the pressurized cartridge. I don't notice it because when I take notes, I do not care if the header has a small blob of ink or the like.
Date published: 2008-08-25
Rated 5 out of 5 by from Best Pen Ever!!! As a Paramedic I work in many different environments. I need pens that are reliable in any weather and anytime. The Fisher Pens are the BEST!!! No other pen I have used performs as well as the Fisher Space Pen!!! I own three of these and I am sure I will buy more!!!
Date published: 2008-01-23
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We are going to extreme altitude with this.  I noticed it says the cartridge is pressurized.  Does it have a rating or information for going to elevations of about 20,000 feet above sea level?  Thanks

Asked by: ScottF
The Space Pen Military Pen is capable of writing in space, so writing at any altitude is not an issue. For temperature, it is capable of writing in conditions down to -30 degrees Fahrenheit.
Answered by: REIservice
Date published: 2016-08-18

How much does this pen weigh?

Asked by: Soxford
We apologize, but we cannot remove the pen from its packaging in order to get a precise weight.
Answered by: REIservice
Date published: 2017-05-20

Is this pen click or twist style operation?

Asked by: SWD112
​This pen is a 'Cap Activation' model; it's a click-style.
Answered by: REIservice
Date published: 2017-05-11
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