well, i picked up a digital thermometer/hydrometer from work today (kmart) and put it in rexs cage. the analog thermometers were 5 degrees to low on one end, and 5degrees to high on the other. the hygrometer was 15% to high.
note* the 15-20 dollars that these digital thermometer/hydrometers cost are worth it, dont be stupid like me and think analogs are actually acurate.