The stick-on thermometers can be off by 20 degrees or more, so your best bet is to go get a digital one, like the indoor-outdoor thermometer/hygrometer combo discussed in another thread which is available for ~$15 at WalMart. One quick trick to try to raise humidity is to use a ceramic or glass dish for your water dish and keep it at least partly on the heating pad. That can give you a several point bump in humidity. Another one, as in the thread Judy pointed you to, is to cover (most of) the top with anything from duct tape to aluminum foil to contact paper. Between the two of those, you ought to be able to get your humidity up by as much as 20%.