Regulations Governing Self-verification Conducted by Measuring Instrument Enterprises Article 9
The measuring instruments passed in self-verification shall be affixed with a verification mark, which is composed of a square Chinese character " " and a self-verification permit number; the ratio of the lines and spaces of the character " " thereinto shall be 1:2, and the self-verification permit number shall be closely right under the " " character, if they are on the same side.Article 9.pdf
中文原文 度量衡業自行檢定管理辦法第9條
（因條文排版無法完整呈現內容，請詳閱完整條文檔案）經自行檢定合格之度量衡器應附加檢定合格印證，其式樣由「」字正方形及自檢許可字號組成，「」字線條與間隙之比例為一比二，自檢許可字號與「」字在同一面時，應位於「」字正下方。