Transparent square, suitable for drawing and measuring straight lines, vertical lines, angles, parallel lines and more.The scales are made with precise screen printing technology and are resistant to wear and tear during normal use.Scale in millimeters on the hypotenuse 7 cm from the center on both sides, each centimeter identified with a number.Protractor scale from 0 to 180 degrees on the legs and arc protractor scale from 0 to 90 degrees in the center of the hypotenuse to both sides.Grade scale with identification of each tenth of a degree with a number.The numbers on the arc protractor scale have a yellow background.Transverse millimeter scales perpendicular to the hypotenuse allow parallel lines to be drawn with identification of every fifth millimeter with a number.Scales accuracy of 0.2% of the length.The square is designed for technical drawing and drafting in schools and offices.