That means it can be used in pretty much any environment that you find yourself. The unique Fisher gas-pressurized cartridge system and high precision manufacturing tolerances means that ink is supplied to the ball point only when it's needed there. The thixotropic ink, with a consistency similar to that of very thick rubber cement, flows as a result of the shearing action of the rolling ball in its socket.. This shearing action liquifies the solid gel ink, allowing the pen to write smoothly and dependably on most surfaces and even under water. So you're not just buying a pen here, OK?
Paul Fisher had been manufacturing better writing instruments with a devotion to accuracy, intellectual honesty and fairness long before the United States Space Program began. But when astronauts started to explore the reaches of outer space, Fisher realized that no existing pen could perform in its boiling hot vacuum. His common sense approach and practical experiments resulted in the invention of the sealed-pressurized Fisher Space Pen. After months of rigorous testing, NASA selected the Fisher Space Pen for use on all of the Apollo missions. They are still used on all manned space flights American and Russian
Tech Spec:
Pink-plated metal body
Contains a PR4 Black Ink, Medium Point Pressurized Fisher Refill
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