As someone with limited knowledge in carpentry and plumbing, I was hesitant to purchase this product.However I was pleasantly surprised by its accuracy and user-friendly features. Based on my observations, this protractor is a highly durable and dependable measuring tool for both DIY and professional projects. The aluminum construction adds to its industrial and scientific appeal. The only con I noticed is that it may take some time to get fully accustomed to its various measurements and functions. Overall, I highly recommend this product to anyone in need of precise dimensional measurement..