For years I have used two old chrome Fisher Space pens. I had to replace one cartridge but they work hot or cold and upside down. So I decided to pick up a couple that of the black cased versions because they are not reflective and they seem to be just as good still made in the same factory in the USA. They are now my stock in my EDC bags. I have a few of the "tactical pens" but space is a premium and a 3.5" pen fit pretty much anywhere. A common urban legend states that NASA spent a large amount of money to develop a pen that would write in space (the result purportedly being the Fisher Space Pen), while the Soviets just used pencils. There is a grain of truth: NASA began to develop a space pen, but when development costs skyrocketed the project was abandoned and astronauts went back to using pencils, along with the Soviets. However, the claim that NASA spent millions on the Space Pen is incorrect, as the Fisher pen was developed using private capital, not government funding. NASA – and the Soviets – eventually began purchasing such pens. NASA programs previously used pencils (for example a 1965 order of mechanical pencils) but because of the substantial dangers that broken pencil tips and graphite dust pose to electronics in zero gravity, the flammable nature of wood present in pencils, and the inadequate quality documentation produced by non-permanent or smeared recordkeeping, a better solution was needed. Russian cosmonauts used pencils, and grease pencils on plastic slates until also adopting a space pen in 1969 with a purchase of 100 units for use on all future missions. NASA never approached Paul Fisher to develop a pen, nor did Fisher receive any government funding for the pen's development. Fisher invented it independently and then, in 1965, asked NASA to try it. After extensive testing, NASA decided to use the pens in future Apollo missions. Subsequently, in 1967 it was reported that NASA purchased approximately 400 pens for $6 a piece. In 2008, Gene Cernan's Apollo 17-flown space pen sold in a Heritage auction for US$23,900.