Magnetic Digital Angle Locator, 2 Button, Automatic LCD Backlight, Automatic Digit Inversion For Overhead Measurements, Angle Display In Degree, Working Range Of Angle Measurement 4 x 90 Degree, Magnetic Base, Ideal Tools For Woodworkers, Astronomers, Electricians, Machinists, Plumbers & Homeowners For All Leveling Projects Such As Hanging Pictures & Mirrors.