STAINLESS STEEL RULERS: Crafted from robust stainless steel, the rulers feature laser-etched markings that clear, precise readings and long-lasting performance. This tool is designed to withstand the rigors of daily use in various environments. HIGH ACCURACY AND CONVENIENCE: Offering an accuracy of ±0.3 degrees, this protractor is perfect for tasks in woodworking, crown molding, and more. It has a folded length of 7 inches (200mm) and extends up to 400mm, providing versatility for different project sizes. PATENTED MEASURING TECHNOLOGY: This digital angle finder combines a ruler and a protractor, enabling easy measurement of both inside and outside angles. Its innovative design simplifies complex tasks, making it ideal for professional and home use. LOCKING FUNCTION FOR EASE OF USE: The angle finder can be locked at any desired angle, simplifying measurements and ensuring consistency. This feature is particularly useful for repetitive tasks and when maintaining a specific angle is crucial., Manufacturer: Littimoon