[2 in 1 Protractor] Combination of stainless steel digital ruler and protractor. This digital protractor can be used as a ruler or a protractor, which is suitable for measuring inside and outside angles. [High Accuracy] The accuracy of the protractor is 0.5 degrees. The hinge mechanism on the angle ruler can measure 360 degree inside and outside angle. It is a good choice for most projects such as woodworking, measuring and everyday use. [Locking Function] For easy reading, the digital angle ruler features a lock feature that makes all types of jobs easy and quick. [Digital Display and Unit Conversion] The protractor is equipped with a beautiful, easy-to-read LCD display. No more guessing or observing angles and lengths with a handy tool. With the "" or " button you can quickly switch between degrees and scales. [Precaution] The package of the digital protractor has a blue protective film, please remove it when using. recommended to avoid contact with children as much as possible and to remove the ruler after use.