Digital Angle protractor has the function of a ruler and a protracting tool. The combination of a millimeter and inch scale ruler and a protractor makes it easy to measure internal and external angles. Suitable for woodworking, construction, drafting, and other fields. ?2 in 1 Digital Angle Finder? PDDYIER protractor has the functions of ruler and protracting. The combination of millimeter and inch scales with protractors makes it easy to measure internal and external angles. Great for woodworking, architecture, drawing, and other fields ? Including 2 batteries ? It is equipped with a CR2032 button battery inside, and you can use it directly after receiving it. We have also provided you with an additional battery as a backup.We have obtained a test report from an ISO 17025 accredited laboratory that complies with UL 4200A ? Large size LCD display and precise reading ? The PDDYIER digital protractor is equipped with a large size LCD display for easy reading; Measurement range: 0~999.9 ; Accuracy 0.3 ; Resolution 0.1 ? Lock, zero, hold, and reverse angle functions ? Rotate the lock knob and press the hold function button to maintain the reading, and the protractor can be locked at any angle. When you perform large angle and reverse measurements, long press and hold the Rev button, and the displayed content can be read upside down. The zero button can reset the angle measurement tool at any time ? Widely used ? PDDYIER provides 90-DAY return and replacement service lifetime free customer service. Combining the functions of digital goniometers and protractors, it can be used to measure all angles in the workshop, with a wide range of applications, such as checking the angle of desktop saw blades or the accuracy of oblique saws, conducting angle cutting or measurement, trimming or wall angle measurement. Perfect gift for carpenters, architects, DIY enthusiasts, etc