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Today, the situation often occurs pen cap lost while out of office when the pen is inconvenient to carry too large a volume, direct debit in pockets not beautiful nor gas field, in addition we can not understand the ink usage when writing.
Portable Pen has three characteristics, the biggest feature is retractable, it may be as you think and retractable pen body any place, which is the origin of the name Portable Pen. Second, you can watch at the time of writing into the pen ink use amount, easy to replace cartridge. Finally, Portable pen set up to facilitate the pop-up clip for easy fixing.