IMHO, I think the best location for a hygrometer is somewhere centrally within the enclosure. To close to the bottom will give you a higher reading while being to close to the top will give you a lower reading due to being to close to the basking bulb. If you were to look at the care sheets offered here on the Forums, it would state that Panther's need a humidity level of 50-70%. I personally like to keep mine on the higher end of that number.