1Basic Specifications: The digital display angle ruler made of stainless steel is not only practical and durable, but also the ruler and protractor are 2 in 1 for easy measurement. 2Digital Calculation: The digital display angle ruler has a clear screen display, which can quickly and easily read the measurement results the digital calculation system makes the angle and length measurement faster and more accurate. 3Data Lock: This is a digital display angle ruler with data lock function, the data can be rotated and displayed, and can be locked. 4Locked Device: The digital display angle ruler has a well designed locking device, simply release your hands and lock the angle with a slight twist. 5Multifunctional Angle Ruler: Protractor is definitely a convenient supplement to any toolbox, widely used in automobiles, meters, construction, shipbuilding, woodworking, engineering, etc. Item Type: Digital Angle Finder Ruler Model: PD290 Material: Stainless Steel Uses: Automobiles, Instruments, Construction, Shipbuilding, Woodworking, Engineering, etc. Battery: 3V CR2032 x 1 Button Battery (without Battery) Measuring Range: 0-360 Scale Unit: Metric Scale, Imperial Scale Graduation Value: 0.05 Accuracy: 0.2 Repeatability: 0.05 Switch Key: ON OFF Clear Key: ZERO Lock Data Key: HOLD (Short Press this Key) Rotating Display Key: Rev (Long Press this Key for Three Seconds) 1 x Digital Display Angle Ruler