Тот кто на отлично знает английский, проверьте, отредактируйте. Плс

Извините, пришлось "поглумиться" немного над Вашим текстом) но теперь за смысл и перевод могу ручаться.) )
Правда, не знаю цели этого текста, эта ручка ведь лет 50 назад была придумана? Для космонавтов по-моему?

I would like to tell you about a specical ball pen which was invented by an American businessman Paul Fisher.
The rolling ball is made of tungsten carbide. The ball is precisely fixed to avoid leakage.
Ink stays a gellike solid until the writing movement of the ballpoint turns it into a fluid. The ink in the cartridge is pressurized with nitrogen at 2,4 atm.
A sliding float separates the ink from the pressurized gas.
This ball is claimed to write for 3 times longer than a standard ballpoint pen
The pen can write at altitudes up to 3810 m. The working temperature extreems range from -35 to 120C
The shelf live is approximately of 100 years

I would like to speak about....

и еще я вообще не поняла что вы хотели сказать ink — firm in a usual condition also are diluted by the letter
так вроде все нормально.

I shall tell about a specical ball pen which was created by AN American businessman Poul Fisher.
The writing ball is executed from carbide tungsten. The ball is precisely established to avoid course.
Ink — firm in a usual condition also are diluted by the letter; ink IS squeezed out by the compressed nitrogen at pressure nearby 2,4 атм.
The sliding float separates ink from the compressed gas.
Affirms, that this handle it is possible to write three times more (запятую можно не ставить, это не русский язык) than usual ball.
It also can write at heights up to 3810 m. Working temperatures RANGES from W22;35 up to 120 °C.
Working life of 100 years. - Что это значит? Некорректно постороено предложение.
ну всё, вроде ничего не пропустила)