【Durable Protractor】The digital angle finder made of carbon fiber and ABS, wear resistance, not easy to deform and will not scratch your hands, lightweight and durable, easy to carry. 【Large LCD Screen】This digital angle finder is equipped with a larger LCD screen for clearer and faster readings. The precise laser engraving scale is obvious, even for a long time, it will not be blurred. 【High Precision】The accuracy of this angle finder is ±0.1 degrees, resolution 0.05°, measuring range: 0-999.9°, folded length: 7.9 inches/200 mm, total length: 15.7 inches/400 mm. NOTE: Before measuring the angle, you must place the ruler horizontally and reset the value to zero. Otherwise, the measured value will be inaccurate. 【Hold/Rev and ZERO Function】Short press the Hold/Rev button, you can hold and keep the data; Long press the Hold/Rev button, the display can be reversed, this function will be more convenient when you measure a large angle and do reverse measurement. Short press the Zero