2 in 1 Digital Protractor - Not only measure length, but also 360° angle (inner angle, outer angle). Locking Function - Use locking screws to lock both legs in the desired position or angle. 1\" Large LCD Screen - LCD with electronic digital display, you can switch between degrees and minutes with the \"°/\" button. The \"HOLD\" button stores data during measurement, the \"ON/OFF/Zero\" button resets the data to zero by short press at any angle; Angle lock button for each angle. Length, Width and Accuracy - Length measurement: 400 mm; Measuring angle: 000.0°~999.9°; Accuracy; ±0.3°; Resolution: 0.1°; Measuring range: 0-360°. The ruler is forged from high-quality stainless steel, ensuring quality, corrosion resistance and durability. Excellent Quality - The premium forged stainless steel scale is laser engraved (mm and inch scale), durable and corrosion resistant. High-Quality Service - If you have any questions about use, installation, and product, you can contact customer service at any time. We will solve the problem within 24 hours. The ruler may be a little sharp, please wear gloves when using it. Specifications: Length: 200 mm/8\" Material: Stainless Aluminum Working range: 0-360° Angle accuracy: ±0.3° Working temperature: -10℃ - 50℃ Dimensions: 28.7*11.18*2.779 cm Average battery life: 000 hours Weight: 300 g Battery: 3V CR2032 battery