It is a protractor and ruler combination ... Johnson Level & Tool 700 Magnetic Angle Locator Image source: Johnson/Amazon The Johnson Level & Tool 700 Magnetic Angle Locator works in any home ...

The whole thing is built around an electro-magnet, so the jig will only work with magnetic metals ... The rotating protractor arm is made from a slab of aluminium and holds all the other parts ...

Which digital protractor is the best? Protractors, both manual and digital, are used to measure various angles. You might find yourself needing one for a DIY home project or if you’re building ...