1、Standard: The scale is clear and scratch free, in line with international standards, high accuracy measurement and accurate spacing, practical and beautiful. 2、3 Sizes: This engineering ruler has 3 sizes of 15cm, 20cm, and 25cm, suitable for enthusiasts who love computers, electronics, and electricians. 3、Metric And Inch Measurement: The ruler includes basic functions such as measuring metric and inch sizes, drawing lines, and measuring angles. 4、Multi Function: It also integrates the commonly unit SMD components standard package, line width size reference, drilling size reference used in drawing PCB. 5、High Quality Material: Fine workmanship, the ruler is made of gold plated PCB material, high hardness, good wear resistance, and durable.