Suggestion: I suggest you increase the destruction temperature of the science thermometer.
Reason: There doesn't seem to be a stock way to track part temperature during flight, burn, re-entry, etc. The science thermometer would be a decent tool for this (especially now that you can pin those windows) if it didn't burn up at the temperatures of interest.
Consequences: I think this would fit the stock game well. Science devices should be fragile, but real-life temperature sensors can withstand incredible heat, and the kerbal temp. sensor feels like kind of an early-game, beat-em-up type part anyway.