These electronic protractors have a digital display you may flip, using the reverse function, for easier reading in overturned positions. Quickly reset the display for delta determinations with zero mode, and obtain measurements in unique environments using the embedded blade magnets—good to 25 pounds of pull! Press the hold button to freeze a measurement and you can move the blades and meter without interfering with the display; simply press the hold button again to resume measuring. Choose from 4-inch or 12-inch long blade options to suit your application needs.