The propeller protractor is a device that accurately sets the pitch of your propeller blades to within 1/4 degree. 
It can also be used for a variety of other applications such as wing surfaces, tail sections or anything needing to be measure by degrees. 
The propeller protractor makes it easy to prepare the propeller for adjustment by:
1. Setting the blades to horizontal
2. Set the hub to vertical
3. Measure the blade pitch
 
With the propeller protractor secured in place on the blade, you can adjust the pitch to the required standards.