is it true you must add a degree to mercury thermometer?

  • Thread starter Thread starter jlcsunshine20
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jlcsunshine20

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if my temp is 102 on a mercury(old style) thermometer is it true i must add a degree to that making it 103?
i guess it is old wives tale just wondering.....about the sticking it in my bum not happing today.its really my 6 month old that is sick
i did it under her arm it was 102 now i did rectal it 103.
 
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