I will never EVER own another swing arm hydrometer again. A few months back, my floating hydro broke since I was genius enough to step on it. Before it broke I double checked it against my trusty ol' swingarm. Both were the same. Yesterday, my order came in from zoafrag, and just for kicks, I checked the salinity to find it was off, bigtime. I checked my water, 1.024 and I acclimated. This already had me scared that either my swing arm was off badly, or that John from zoafrag's stuff was off. Since the latter of the two seemed impossible, I rushed some water over to Jeremy who was in the midst of leaving to go pick up his order from the airport. He called me VERY concerned. He stated that my salinity was at a whopping 1.033.... Initially we both considered the fact that it may be off due to temperature, since he had the water for awhile. Tony came by to pick up his superman, and I bagged it up and he went to B&B. After that, he went home only to find VERY similar results. 1.032

Here is the part where I could smell detrirtus building in my shorts.
I checked again with my swingarm and it showed 1.026.

Needless to say I drained about 10 gallons of water and put in some fresh. I did this immeadiately. I am goingto run home during lunch and hope to be able to run by B&B again to retest my water.
I did notice that my corals were turning brown, but this was after a complete re-aquascape of my tank, so I had attributed it to the changing. WRONG.

For the love of your tank, ditch the swingarm, and get a refractometer.
I still cannot understand how my fish/inverts/corals are still alive, and I can give God another high-five for saving my tank.

Lesson Learned? Buy right the first time.