The Chrono-Logger was a time machine that sent Paradox and Hugo as the 1950's Monster into Ben's time.
Ben helped Hugo as Humongousaur get away from the portal that the Chrono-Logger created in Ben 10 Alien Force episode Paradox.
It uses quartz to cause a reaction in the chronotons thus drilling a tunnel through time when Hugo's fear caused a malfunction it trapped Paradox in time and warped Hugo to the present as an age causing monster that is undefeatable. A Chrono-Logger like device will make an appearance in Ben 10: Alien Force Season 2.