Feeler Gauges, Vernier Calipers -Combination Square Ruler Highlights Generic Brand Combination Square Ruler Description: Tri-Square Solid Combination: well made of high quality stainless steel, rustproof, durable and strong to use with clear and precise calibration Easy to read: 0-180 degree measuring range, 12 inch slotted and engraved stainless steel ruler for easy reading Fine workmanship Finished with a chamfer extension, thumbwheel knob and fine adjustment , ideal for measuring inside and outside corners of workpieces Portable and Convenient: Featuring a practical and functional design, saving you lots of measuring tools and making your workbench neat and tidy 100% brand new with high quality, Convenient and durable to use Specification: Material: Stainless Steel Total Size (W x H): Approx. 300mm x 120mm / 12inch x 4.72inch Color: Silver as shown in screen pictures Measurement Range: 0-180 degree Grading Value: 1mm Accuracy: 5' / 0.08 degree Color: Green as shown in the pictures shown Package includes: 1 set of combination square ruler Note: Calibration measurement should be zero, universal angle ruler is zero, when the squares are equipped with a ruler and the bottom edge and the base square foot are in contact with the rule without gap, then the "0" line of the main scale is aligned. After adjusting the zero position by changing the mutual position of the base scale, square angle, the ruler can test any angle between 0 and 180.