You can get combo squares for 1/10 the price of this Starrett but if you do a lot of work with one you will instantly love this (or any Starrett). Extremely well made. The blade is super durable and very easy to read. If you have ever fumbled with others when trying to reinsert the blade back into the head you'll love the way Starrett's furled nut/ locking system works. Very precise and holds the 90/45 extremely well. The lock bolt is very sturdy, operates smoothly, and will not fall out.