A thermostat is used to regulate temperature. A thermometer is used to measure temperature.
The analog/dial type stick-on thermometers are inaccurate at best, dangerous at worst as they tend to unstick themselves from the side of the enclosure and then end up stuck on your snake. Get digital thermometers with probes.
What are you using for heat sources, what kind of thermostats are you using to ensure that the enclosure doesn't get to hot and burn your snake, and where are the thermostat probes located?
How long have you had this snake and where did you buy it?