Calligraphy Rulers by Aquino da Silva
Calligraphy Rulers by Aquino da Silva Calligraphy Rulers by Aquino da Silva Calligraphy Rulers by Aquino da Silva Calligraphy Rulers by Aquino da Silva Calligraphy Rulers by Aquino da Silva Calligraphy Rulers by Aquino da Silva Calligraphy Rulers by Aquino da Silva Calligraphy Rulers by Aquino da Silva Calligraphy Rulers by Aquino da Silva Calligraphy Rulers by Aquino da Silva
HK$60

ES Ruler supports 3mm to 7mm X-height and scale for 2:1:2 and 1.5:1:1.5 at a 55 degree slant. 

Spencerian Ruler supports 1mm to 3mm x-height; with 3:2:3 proportions at a 52 degree slant.