Description: This item is made of high quality stainless steel, anti-rust, durable and sturdy to use. Its measuring range is 0-180 degree and finished with a bevel edged extension blade, roller knob and fine adjustment. With a 5' (minute)/0.08 degree accuracy and engraving scales, it's great for measuring inner and outer angles of the parts. Instruction: Calibration measurement should be null, universal angle ruler null, when Square are fitted with a ruler, and the bottom edge and the base Square foot in contact with the ruler, then the main scale "0" line aligned. After adjusting the null position by changing the mutual position of the base scale, angle square, straightedge can test any angle within the range of 0-180 °. Specification: Condition: 100% New Brand Color: Green (Shown as picture) Material: Stainless Steel Measuring Range: 0-180 degree Accuracy: 5' / 0.08 degree Package Weight: 1.358kg Package Included: 1 x Universal Bevel Set 1 x Case (Full Components Shown in Picture) Features 0-180 degree measuring range, and its accuracy is 5' / 0.08 degree Made of high quality stainless steel, anti-rust, durable and sturdy to use. A case provided to you, convenient for you to use Each scale line is engraved, so it is engraving scale Great for measuring inner and outer angles of the parts Finished with a bevel edged extension blade, roller knob and fine adjustment