Fowler 74-422-450-1 Mini-Mag Protractor Embedded magnets with 5 lb. pull Measuring range: 360 (4 X 90) Resolution: .05 Accuracy: +/- .2 Repeatability: +/- .1 Embedded magnets with 5 lb. pull Measuring range: 360 (4 X 90) Resolution: .05 Accuracy: +/- .2 Repeatability: +/- .1