The legendary pen used by NASA astronauts has $20 off for a few more hours

Fisher Space Pen Original Astronaut Pen deal.

I've you've ever been let down by your pen when you needed it the most, it might be time to turn to specialist hardware. Fortunately, there's still time to save over $20 on Fisher Space Pen's Original Astronaut Pen if you get to it before Amazon Prime Day ends tonight. It's currently at the cheapest price we've seen in last four years!

Used by astronauts since as far back as Apollo 7, the refillable pressurised ballpoint spaced pen is designed to keep writing at extreme temperatures, underwater, in zero gravity and at any angle, even upside down.

That might might not be things you need if you're using a pen to write a shopping list, but, it's good to have a pen you know you can rely on, even in this digital age. It also looks very sleek too in the black titanium nitride edition that's currently on sale.

• Get 20% off the Fisher Space Pen Original Astronaut Pen at Amazon

More late Prime Day deals on stunning pens

See below for more late Prime Day deals on beautifully designed pens. You might also want to check out our guide to the best pens for artists.