1、2 IN 1 ANGLE RULER: The combination of scale ruler (mm and inch 2 units) and protractor makes it easy to measure length, internal angle, outside corner. 2、WIDE RANGE: The ruler can measure a maximum length of 200mm, and the protractor is measurable from 0 to 360 degree, with high accuracy. 3、MULTI FUNCTION: The protractor can be locked at any angle by turning the lock knob. Pressing the HOLD button will keep the reading. Long press and hold Rev button, the display screen can convert ° and '. Zero button allows resetting measurement. 4、LCD DISPLAY: Digital angle ruler is equipped with large LCD display screen, which is easy to read, with a resolution of 0.1°, can obtain clear readings even under low light conditions. 5、WIDELY USED: This angle ruler is suitable for woodworking, construction, drawing, etc., can be given to carpenters, constructor, DIY enthusiasts, etc.