Why buy some flimsy plastic spirit levels when this bad boy will last a lifetime? Really solid construction at this level, I wouldn't mind taking it to any job site (other than getting it stolen because it's so pretty). Appears as machined aluminum surfaces with epoxy adhesive holding glass sensors together. The magnet is strong enough for the purpose, won't fall off work, but you don't have to struggle to take it off either. Electricians may find these more useful than others with built-in conduit elbows. I don't bend pipe very much, but this thing is just as good for general alignment as it is for specific pipe bends. 5/5 I would buy again for myself or as a gift for others.