This easy to use tool has two scales It couldn't be easier, read the protractor, set your miter saw, cut,....
The 505 Prosite Protractor family has been expanded to include the new 505P-7. Constructed from durable engineered plastic and economically priced, the 505P-7 eliminates calculations, reduces errors and provides greater accuracy for miter cuts. Simply set your saw to the angle that you read on the protractor. Upside down or backwards, the reading is always correct. The Miter Cut Arrow and Inner Scale indicate the exact miter saw setting for an accurate miter joint every time.