He bud,
Multiple reasons:
1) Jumpstart and similar thermostats are on/off thermostats so that when temp > set temp (say 90 F) it shuts off electricity and the the heat starts to escape. As the temperature starts to drop (as measured by the probe), the thermostat allows power to reach the heat mat and so on and so forth. Some thermostats work by reducing the wattage?/voltage? that reaches the heat mat and thus reducing its temperature without abruptly shutting off.
2) I am guessing that your probe is giving you the temperature of whatever surface its touching and your temperature gun/reader is giving you the surface temperature inside the tank/vivarium and those are two different things because some of the temperature dissipates and some is absorbed by the medium (glass).
What I do, is I glue (glue-gun kind of glue) my temperature probes on the base of my hide so that the temperature those cheap thermostats (Jumpstart and co.) read is exactly the temperature the snake is touching








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