Zebra's SharboNu Multi-Function Rotary Pen is a convenient pen to have in your case as it includes three different modes: black pen (0.7mm), red pen (0.7mm), and mechanical pencil (0.5mm). Switch between the three easily by simply rotating the pen to your desired mode.
Using "Emerging Ink", the SharboNu pen's ink has more contrast and color than regular ink.
