1. The high-grade ballpoint pens have obvious trademarks and model marks on the pen holder, and there are also obvious brand names, production dates and "DA" marks at the end of the refill ("DA" marks are the first two characters in Chinese Pinyin of archives. combination of letters).
2. Isi semula tiub minyak logam mesti digunakan, dan bebola kepala pen mestilah diperbuat daripada bebola tungsten karbida - aloi keras. Prestasi penulisan adalah lebih baik daripada pen mata bola biasa. Dakwat yang dituangkan ke dalam isi semula mestilah 424 dakwat biru tulen yang dihasilkan pada titik tetap. dan 322 dakwat hitam. Kedua-dua dakwat ini mempunyai kelebihan kepantasan cahaya, rintangan air dan kebolehtelapan. Isi semula ballpoint yang diisi dengan dua dakwat ini boleh digunakan untuk penulisan arkib (termasuk isian semula tiub plastik, tetapi warna tiub mestilah tiub kuning muda).
3. On the packaging of the goods, there are signs and marks such as the trademark, model, manufacturer name, place of origin and quality inspection certificate. Fake and shoddy goods, the ink poured into the refill is not the archival ink recognized by the State Archives Administration, there is no "DA" mark on the refill, and there is no trademark, model, factory name, origin, and some are smuggled from abroad. Unlicensed pens The core is assembled to pretend to be an imported high-grade ballpoint pen.
