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's a good choice for most projects such as woodworking, measuring, and everyday use. Locking Feature For easy reading, the digital angle ruler features a a lock feature that makes all types of jobs quick and easy. Digital Display and Unit ConversionThe 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 ""/" 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. It is recommended to avoid contact with children as much as possible and to remove the ruler after use.