Setting Up an Experiment to Test Efficiency of Old Thermos

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An experiment is being set up to test the insulation efficiency of an old thermos using boiling water and a candy thermometer. The user seeks a small, waterproof, heat-resistant thermometer that can record temperature at set intervals over 24 hours. Suggestions for suitable devices or design ideas are requested, with Omega mentioned as a potential source for temperature sensors and data acquisition setups. The focus is on finding a reliable method to gather accurate temperature data over time. This inquiry highlights the need for specialized equipment in experimental setups.
spl3001
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This is kind of a specific question relating to an experiment I'd like to setup.

I have an old thermos, and I thought it would be interesting to see how efficient it is at insulating its contents. I did an ad hoc experiment using boiling water and a candy thermometer, but I only sampled the water twice with any accuracy.

What I would like to know is there such a thing as a small water proof/resistant, heat resistant, time-interval recording thermometer? Just some small device that would record the temperature for 24 hours or so at some interval. I have no idea where to look for something like that. Any design ideas would be appreciated as well.
 
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