I believe you're confusing thermoMETER with thermoSTAT. A thermoMETER only reads the temp while a thermoSTAT regulates the amount of heat the equipment produces. I don't see any thermoSTATS in the picture.
Unfortunately, those stick-on analog thermometers (the dial ones) are incredibly inaccurate as well, so don't rely on those, they can be off by as much as 15°.
Also, I see an incense burner by the enclosure. I hope you're not burning incense there. That smoke is incredibly bad for a snake.