Question

why should thermometer should we washed before use and after use ???​

Answer 1

Sterilizing the thermometer after each use prevents you from contaminating other people in your family. It also keeps the sensor free of anything that could interfere with accurate readings. Clean the thermometer before and after each use.

Answer 2

Too prevent spread of germs I use rubbing alcohol after each used to make sure germs are not spread. You can also use the plastic cover that come with most thermometer.