300mm Angle Ruler with LCD Display and Lock Function Easy to read and accurate:. Backlit LCD display for easy reading. Accuracy 0.5; Resolution 0.05/3'; Measuring range: 0-300mm (11 inches) / 0-360. Lightweight:. Made of carbon fiber and ABS material, it has good rigidity, wear resistance, not easy to deform, does not scratch your hands, and is easy to carry. Multi-function measurement:. Can combine ruler and angle sensor to measure angles and lengths. Very suitable for measuring internal and external angles as well as object angles. Data hold function:. With a lock button, you can lock the angle at any position, and the hold button can always keep the angle without the risk of data deviation.