Features Accurate Measurement Standards - Designed to meet international standards, this ruler offers high accuracy for precise measurements and clear markings, ensuring reliability for all your engineering tasks Versatile Size Options - Available in 3 convenient sizes (15cm, 20cm, and 25cm), this ruler caters to the diverse needs of electronics enthusiasts, engineers, and electricians alike Dual Measurement System - Equipped with both metric and inch scales, this ruler simplifies measuring and drawing, making it an essential tool for various projects in electronics and engineering Comprehensive Multi-Functionality - Features integrated references for SMD components, line widths, and drilling sizes, providing all the necessary tools for PCB design and layout in one ruler Durable Gold-Plated Material - Crafted from high-quality, gold-plated PCB material, this ruler ensures exceptional wear resistance and longevity, making it a reliable companion for any electronic project Features: 1、Standard: The scale is clear and scratch , 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、 Material: Fine workmanship, the ruler is made of gold plated PCB material, high hardn, good wear resistance, and . Specification: Item Type: Engineering Ruler Material: PCB Product Specification: Approx. 15cm/5.9in, 20cm/7.8in, 25cm/9.8in Color: Black Gold Plated Range: Metric: Approx. 15cm/5.9in, 20cm/7.8in, 25cm/9.8in Inch: Approx. 6in, 7in, 8in Commonly Used Line Width Size Reference: 8mil, 10mil, 15mil, 20mil, 25mil, 30mil, 40mil Common Drilling Reference Size: Approx. 1.0mm/0.04in, 1.5mm/0.06in, 2.0mm/0.08in, 2.5mm/0.10in, 2.5mm/0.10in, 3.0mm/0.12in Package List: 3 x Engineering Ruler Note: Manual measurement, please allow some errors. Package List 3 x Engineering Ruler