How to distinguish high quality and poor aluminum truss

First of all, the high-quality aluminum truss are well welded with accurate dimensions, and There will be no misalignment of screw holes or mismatch between truss and accessories.

The poor quality aluminum truss has rough welding, irregular shape, different sizes and unsightly welding joints.

Secondly, the high-quality aluminum truss are all dipped in acid,The surface is bright silver,It's novel and elegant, and shining.

The poor truss is not dipped in acid, the surface is dull and earthy gray,It's like an old antique.