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- It’s forbidden to measure precisely on Shabbat as it’s considered Uvda DeChol, a weekday activity. 
- It’s permissible to measure for the purposes of a mitzvah such as measuring Bitul BeShishim, 40 Seah for a Mikveh, or the temperature of someone sick. 
- ↑ Mishna Shabbat (157a) writes that measuring for a mitzvah is permitted implying that there’s a prohibition of measuring on Shabbat if not for the purpose of a mitzvah. This is also the opinion of Tur and S”A 306:7 and Mishna Brurah 306:34.
- ↑ S”A 306:7, Mishna Brurah 306:35