The Tuff-Writer pen was designed to be the toughest pen out there, period. It is built to withstand blistering cold, intense heat and any kind of harsh environment an operator is bound to encounter.
The thixotropic ink in the hermetically sealed cartridge and pressurized to nearly 35 psi lasts three times longer than a standard ballpoint pen. With an estimated shelf life of 100 years, the pen writes at altitudes up to 12,500 feet where most other pens simply won't. Best of all, no matter how harsh the conditions your Tuff-Writer will work with operating temperatures from -30 to 250 degrees Fahrenheit (-35 to 120 degrees Celsius).