The RIDGID® Digital Bubble Level features three vials for plumb, level and 45° miter. There is an optional sound feature that allows you to audibly determine your results for situations when you cannot view the screen. The display also shows the exact measurements currently being reported by the sensors. The application allows you to calibrate both the vertical and horizontal vials to allow for phones with buttons or cameras on the side or rear which can interfere with your readings.