Any non-conductive material will block some heat a bit. I use aspen (a thin layer) and place the probe just under the surface rather than buried all the way down to the glass. It gives more accurate readings, but do know what the temp is at the glass as well in case the snake decides to burrow down.
Something thin like paper towels or unprinted newspaper will be more even from top to bottom since the layer is so thin, but will still block a tiny bit of heat.








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