The 2-in-1 ruler/protractor combination for easy measurement is a practical tool for drawing and measuring. The digital calculation system makes angle and length measurements faster and more accurate. Quick and easy reading of the measurement with clear display on the LCD screen. You can also lock the data by pressing the button at the bottom of the screen, so that it will not change again. With the lock button design, you can easily lock the angle in any position; you don't have to worry about the angle changing when you move the ruler. The ruler is made of stainless steel, practical and durable. Suitable for home improvement, woodworking, workshop, etc. Features: The ruler is made of stainless steel, practical and durable. Designed with a locking button to lock the angle in any convenient position. 2-in-1 ruler and protractor for easy measurement. Quick and easy-to-read measurement with LCD display. Digital calculation system makes angle and length measurements faster and more accurate. Material: Stainless Steel Measuring Range: 0-360, 0-200mm Resolution: 0.05 Accuracy: 0.3 IP Rating: IP54 Operating Temperature: 5 ~ 45 Operating humidity: 85% RH Battery: CR2032 3V battery