There are a number of very good new miter gauges available now which should aid you in cutting very accurate angles. If, however, you need to check an angle that you have just cut, and you are not absolutely certain that your saw's gauge is correct, this Vernier Protractor will allow you to measure the angle (obtuse or acute) to an accuracy within two minutes (1/30th of a degree.) If you are making frames of more than four sides or constructing segmented blanks for turning, this protractor will be invaluable. Made in China, it is an extremely high quality tool, well-finished and nicely made complete with its own wooden storage box. Directions are included.