how to test a pen?

.<!--[endif]-->Pen’s ink should be dark so that normal human eyes can read clearly
<!--[if !supportLists]-->2.<!--[endif]-->Pen should be continuously in writing mode
<!--[if !supportLists]-->3.<!--[endif]-->Pen’s ink color and the pen’s body, cap color should be same so that easy to understand the requirement for user
<!--[if !supportLists]-->4.<!--[endif]-->Pen should have the soft grip at the middle place for usability
<!--[if !supportLists]-->5.<!--[endif]-->Pen should be in continuously writing mode under hottest and coolest temperature
<!--[if !supportLists]-->6.<!--[endif]-->If pen drops from the several feet then also it should be in continuously writing mode if ink is available in pen
<!--[if !supportLists]-->7.<!--[endif]-->Pen should not have “Use and throw” type
<!--[if !supportLists]-->8.<!--[endif]-->Pen’s refill should be replaceable
<!--[if !supportLists]-->9.<!--[endif]-->Paper should be straight and clean
<!--[if !supportLists]-->10.<!--[endif]-->Paper should not too smooth and too hard