The Dynamite DMX Tester from Quasar Science is a pocket-sized device that allows every cable in your lighting array to tell you what DMX universe it is part of. Plug the Dynamite DMX Tester into a DMX line, opto-splitter, or node, tune to channel 512 by pressing both buttons, and instantly tell what universe is outputting to the tester. When the lighting system is set up properly using the 512 universe channel theory, simply plug in the tester into the DMX line, press both buttons, and the tester will jump to channel 512 and then show the universe of the cable.