Compared with the 0.7 signature pen, the 0.5 signature pen is thinner. The thinness here mainly refers to the signature pen refill.

Regular exams require the use of a 0.5 mm black pen because when answering non-choice questions, the handwriting cannot be too thin, otherwise the scan results will be unclear and affect the teacher's marking; the handwriting cannot be too thick because the answer sheet The space setting is limited, and there may be insufficient space. The 0.7 mm signature pen is relatively thick and is more suitable for daily use such as writing and signing. ：

The "signature pen" often mentioned in signature pens is actually a functional description with a wide range.

The classification is as follows:

1. The pen tip is a roller-ball structure. Depending on the composition of the ink used, it can be divided into water-based and oil-based. The ink used in gel pens is between water-based and oil-based, and is also called "gel pen".

2. The pen tip has a fiber structure, the pen tip is soft and comfortable to use, and it will be more and more recognized. It is constructed like a ballpoint pen and feels like a fountain pen when writing.

Signet pens can also be classified into broad and narrow senses. Broadly speaking, pens used for signatures are called signature pens. For example, now we often talk about Parker signature pens and Montblanc signature pens, but they are pens that we have been using since childhood. In a narrow sense, it refers specifically to carbon ink pens or as mentioned above, while the signature pen used in the examination is a carbon ink pen in a narrow sense.