Tubular tips for hand-held technical pens using India ink on tracing paper — Part 1: Definitions, dimensions, designation and marking
在描图纸上使用印度墨水的手持式技术笔的管状笔尖第1部分:定义、尺寸、名称和标记
The purpose is that a consistent line thickness within permissible tolerances is ensured with or without lettering giudes and templates. Applies to commonly used draughting operations such as tracing, writing and lettering. Part 2 deals with performance, test parameters and test conditions.