2 in 1 Digital Protractor - Measure not only length, but also 360 angle (inside angle, outside angle). Locking function Use locking screws to lock both legs in the desired position or desired angle.Large 1" LCD display - LCD with electronic digital display, you can switch between degrees and minutes with the / button The ? button HOLD? stores data during measurement, the ? button ON / OFF / Zero? resets data to zero by short press at any angle; angle lock button for each angle.Length, width and accuracy Length measurement: 400mm; measuring angle: 000.0~999.9; precision ; 0.3; resolution : 0.1; measuring range : 0-360. The ruler body is forged from high quality stainless steel, which ensures quality, corrosion resistance and durability.Excellent quality - The scale forged from premium stainless steel is laser engraved (scale in mm and inches), resistant to abrasion and corrosion.High quality service If you have any questions about use, installation and product , you can contact customer service. Multifunction This angle finder ruler can measure both angle and length, in metric and imperial scale. Woodworking: adjusting angles of table saw, miter saw, band saw, etc. < p>Construction Sketch, draw Convenience Measure quickly angles with an accuracy of 0.3 degrees. (0.3 degree means the measurement result may be larger or smaller than the actual angle by up to 0.3 degree. The total difference between two measurements can be up to 0.6 degrees). Easy operation with just two buttons. A good lock function allows you to lock the measurement at n any angle. Compact structure for convenient carrying and use. Accessibility * The rulers of this digital angle finder are made of durable brushed stainless steel. * The angle finder can be used in various areas instead of one angle ruler, straight edge or square ruler, etc. * Easily draw lines with the stainless steel rulers. < p>Technical description and operation Measuring range: 0 ~ 999.9 (must be calibrated before each use) Resolution: 0.1 Folded length: 220 mm Precision: 0.3 (0.3 degrees means the measurement result may be larger or smaller than the actual angle by up to 0.3 degrees. The total difference between two measurements can be up to 0.6 degrees). Extended length: 400 mm Measuring range of the ruler: 0~400mm; 0 ~ 7 inches Measurement: laser engraving Working temperature: 0 ~ 50C. Set includes: Protracor stainless steel *1, , CR2032 battery *1. Battery: CR2032 3V lithium battery Note: The data are all measured manually, please allow one 1-3cm error, due to the difference in light and display, there will be a certain color difference, the actual object received shall prevail.