Compass 2 ($40) is the latest in Twelve South's string of sequels to earlier products, this time a revamp of the first Compass Mobile Stand for iPad. At first glance, the steel iPad stands look very similar, but small tweaks alter the way they function. Still using a three-legged setup, Compass 2 supports all iPads, including the iPad mini. The rear leg now locks in place to help the stand hold its position, and the stand elevates the tablet on an…