this triangular protractor has completely revolutionized my woodworking projects. The clear and precise measurements have made accuracy in cuts and angles a breeze. The durable material and industrial grade quality ensure that the tool will last for a long time .The only con I have discovered is that it's a bit tricky to use if you are not used to the triangular shape but it`s worth it for its precise measurements. Overall, an excellent purchase for anyone in need of precise dimensional measurement in woodworking or any industrial and scientific fields..