【Durable Protractor】 This digital angle finder is made of carbon fiber and ABS, resistant to wear and tear, difficult to deform, and won't scratch your hands. It's lightweight, durable, and easy to carry. 【Large LCD Screen】 Equipped with a larger LCD screen for easier and faster readings. Precise laser scale engraving is clear and won't fade over time. 【High Precision】 Accuracy of ±0.1 degrees, 0.05° resolution, measuring range: 0-999.9°, ruler length: 7.9 inches/200 mm, total length: 15.7 inches/400 mm. NOTE: Before measuring the angle, ensure the ruler is horizontal and reset the value to zero. Otherwise, the measured value will be inaccurate. 【HOLD/REV and ZERO Function】 Briefly press the HOLD/REV button to hold and save data; pressing Hold/Rev reverses the display, useful for measuring wide angles and reverse measurements. Briefly press the Zero button to reset to any angle for greater precision. It automatically shuts off after 6 minutes of inactivity. 【Widely Used】 This digital angle finder measures length and angle (metric and imperial) and is widely used in woodworking, construction decoration, schools, home improvement, mechanics, drafting, and other areas such as angle cuts, trim measurements, wall angle measurement, measurements for crown molding, baseboards, alcoves, flooring, etc.