With the new features on the herpstat the exterior probe placement is quite safe. When enabled the tstat will shut down the heat if the probe breaks free. The same for a dedication at least until it warms back to correct temps. Poop is in the mid 80s as this is the core temp of the snake so it only takes a few min to warm.
Other tstats on the market I would 100% recommend a fail safe regardless and would say an interior placement it is NOT optional and must be used.
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