[2 in 1 protractor] Combination of digital stainless steel 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 Precision] The accuracy of the protractor is 0.2 degrees. The hinge mechanism on the angle ruler can measure the inside and outside angles in 360 degrees. It's a good choice for most projects, such as woodworking, measuring, and daily use. [Lock Function] For easy reading, the digital protractor has a lock function, making all kinds of work easy and fast. [Digital Display and Unit Conversion] The protractor is equipped with a beautiful and easy-to-read LCD display. No more guessing or observing angles and lengths with one handy tool. The "/" key can be used to quickly switch between degrees and scales. [Precautions] The packaging of the digital protractor has a blue protective film, please remove it when using. It is recommended to avoid children's touch as much as possible and put away the ruler after use.