Calligraphy Ruler - 西洋書法工具尺

This ruler designed by Aquino da Silva in 2017, is very handy lining tools. The ruler is the size of a credit card and is suitable for daily practice or lining on small cards and envelopes. 

這把間尺試是阿堅奴於2017年設計和生產。尺寸只有一張信用卡的大小，是非常方便攜帶的間尺工具，適合日常練習使用，尤其是應用在信封或小卡書寫。