The Digital Angle Detectors 4 Button is used for measuring any angle such as to set blade angles on lathes, miter, band, table, chop and circular saws. It’s compact and lightweight and is ideal for a multiple of construction applications. A magnetic base allows for the unit to be attached to metal surfaces such as to a saw blade to ensure the proper bevel angle. Highlights: Accurately sets blade angles on lathes, miter, band, table, chop and circular saws Easily adjust the saw blade angles to any angle you want Strong magnets hidden inside the bottom of the device securely attaches the 824 to saw blades Displayed value always shows right side up, whether the unit is upside down or not Arrow sign indicates the rotating direction 0.1 resolution with 180 measuring range Power source: (2) CR2032 batteries included WARNING: This product can expose you to chemicals including Di(2-ethylhexyl)phthalate (DEHP), which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.p65Warnings.ca.gov/