KEN-597-7500K KENNEDY Angle Finder With Magnetic Base Can be used independently as a ‘quick check’ tool or to convert a rule or square into a precision angle finder. High strength built-in ceramic magnet with Vee Groove for use on bars and pipes. Accuracy ±0.5%. For the most accurate readings it is recommended that the angle finder is attached to a steel rule or square by means of the magnet or screws.