I purchased a Starrett C33H-12-4Ry combo box ($113) along with an Empire Level E250 ($15.94) for comparison. As far as I can tell, both fit the area perfectly. Both are made in the USA, but the Starrett looks heavier and more robust. (It weighs slightly more: 13.875 ounces vs. 11.5 ounces). Starrett's vial only has a small window, making it difficult to "read". In contrast, the Empire E250's bladder is fully open and visible from every angle, although this makes it more vulnerable to potential…