F. UNI-BALL® POWER TANK RT PEN The perfect pen for the field, Powertank performs under the toughest conditions. Its pressurized ink cartridge allows for writing on wet surfaces, in extreme cold (as low as -20 C/-4 F) & at odd angles, including upside down. The ergonomic textured grip ensures lasting comfort while uni Super Ink™ technology protects against water, fading, & fraud.
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