i second the acurite thermometer and hydrometer.

also a thermostat is NEED when using a under tank heater. those things can heat up to 110˚ unregulated. temperatures like that could severely injure your snake.

do a search in the forum for thermostats, there are tons of threads that describe exactly what they are, how they work, which ones are best.

if you can't get a thermostat, a Rheostat is your last option. it will control temperatures, but only if you keep your snake in a room where the temperature doesn't change much. rheostats can be a pain, you'll have to adjust them multiple times a day.

well welcome to the forums, don't be afraid to ask anything else, it's what we are here for. and pictures.... we LOVE pictures here.