I also have an on/off style thermostat, so I get a little fluctuation in temperature but not more than 3 degrees as it cuts on then shuts off. So for my bp cage, the hot spot stays between 88-91. My probe is set in the back wall of the cage, directly under the heat panel about 1-2 inches above the substrate*. It takes some time to dial in because you are setting the thermostat below the temperature you actually want. For example, the thermostat for my bp is set for 80 to kick in and 83 to shut off, but directly under the panel is 88-91.
*Edit to better explain placement of probe.
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