Had to post photos here because the message wouldnt let me.
Anyways, so the red arrow is pointing at the probe which is going to the thermostat (Herpstat 2) in order to control the RHP temp. I double check the temps with the thermometer which is placed at the back of the terrarium. Sorry for my crappy drawings. Lol. Tried my best.
Let me know if that answers your question.
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