This is a practical 2 in 1 angle ruler. It can be used as rectilinear scale and goniometer.Made from 304 stainless steel, it has great durability and abrasive resistance.The large LCD display is very convenient for reading. If you are looing for a digital LCD Display angle ruler, it is your best choice. Features: Using 304 stainless steel, has great durability and abrasion resistance. 360complete measurement. Simple operation with complete function. LCD display is more convenient for reading. Degree scale is clear and exquisite. Come with locking knob, it is more convenient to hold the angle in any position. Specifications: Material: stainless steel Length: 0-200mm, 0-300mm, 0-500mm (optional) Resolution: 0.05 Accuracy: 0.3 Repeatability: 0.05 Measuring range: 0-360 Protection level: IP54 Working temperature: 5-45 Working humidity: