As a mason who works on large job sites, I have dropped a level and now the level no longer work properly. Does anyone make a stronger level?

First let me suggest that you always carry a box beam level. Typically, levels which look like an I carry the load of the weight in the center of their body. While box beams are designed with the weight distributed on the outer walls, making them much sturdier and able to resist bending and breaking. Secondly, look for a level made out of a higher-grade aluminum to give it extra strength.