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In order that the ruler can be used as the water pen can replace parts, we designed a replaceable scale ruler.Most of the materials in the foot are made of wood,the replacement part of the ruler is made of transparent yak material, which combines wood with yak material by stitching, and the replacement part achieves multiple use of the ruler. The scale marks are placed inside the acrylic material to effectively prevent tick wearing due to the long period of use.This design can effectively reduce the pressure of waste plastics on environmental pollution.