Compact and comvenient, easy to use. This product will make your life easier and convenient. Features: 2-in-1,to measure both legnth and angle Easily operation with three function keys Stainless steel scale achieve durable using Inside& ourside angle measure Quick display of the measured value on big LCD screen Fastening screw to fix the measuring angle in any position Both measure the angle and length,metric and inch display Compact structure to achieve convenienct carrying and using Easing drawing line with the stainless steel ruler It could be well used into various field instead of angle rule straight ruler and square etc. Specifications: Material: stainless steel + ABS Specifications: 0-200mm, 0-300mm (optional) Measuring range: 0-360° Resolution: 0.05° Accuracy: ±0.03° Battery: 3V CR2032 battery Working temperature: 0-40oC Working humidity: 80% Package List: 1 * digital protractor 1 * plastic blisters 1 * paper card 1*CR2032 battery