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Question:
Why is the use of color-changing thermometers prohibited on Shabbat, while it is permitted to use glasses that change color?
Answer
This question was posed to HaGaon Rabbi Shlomo Zalman Auerbach (as cited in Shemirat Shabbat Kehilchata, Chapter 18, Section 18).
He clarified the distinction as follows: In the case of glasses, the color change occurs automatically and incidentally by the sun (the action is done “on its own”). However, in the case of a thermometer, a person actively places it on the forehead with the intent to trigger the change. Therefore, it is prohibited.
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