So I emailed Spyderrobotics and this was Dion's response regarding using aluminum tape to attach the probe:
"The issue is mainly putting it over the probe tip/end. The aluminum acts
like a heatsink letting the air temperature cool the probe so it will read
cooler than the heat tape is.
Also putting metal tape on the heat tape can be a hazard in itself.
Occasionally when heat tape fails it starts melting through the plastic.
Metal tape then becomes a shock hazard or could potentially cause a short
circuit depending on how its installed."
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