Brainstorming thoughts:
- If your probe is on the bottom and you're seeing the temp difference on top, moving the probe to the middle could reduce the variation in temperatures from bottom to top.
- Removing the o-ring may be a solution as well. When it comes to heat tape, thermostat probes tend to work best with direct contact.
- What about simply turning down your Herpstat by 5 degrees (and reducing the number of layers of newspaper you have)?
- Maybe the variation is due to the newspaper. Do you see the same variation in temperatures on the plastic itself?
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