Angle Finder Number of Quadrants 3 Base Length 3 1/2 in Overall Height 3 in Lens Material Polystyrene Lens Diameter 4 in Measuring Range - Maximum 90 Degrees Measuring Range - Minimum 0 Degrees Number of Level Vials 0 Number of Plumb Vials 0 Material Plastic Accuracy 0.5 Degrees Color Blue Features Magnet Graduation Units Degrees