I'm in the process of setting up my 180g in the basement and am concerned about temperature swings. Is there such a device out there these days which could log the temperature every hour either from within the tank or attached to the glass? I am not looking at spending much I really just want to measure once just to see how much variance there is in the tank in one 24hr period at this time of year. Eventually I may shell out for an apex, but may have to pray for a bonus to be able to afford one of those...