Quote Originally Posted by kitedemon View Post
Temp guns cannot accurately be used to measure water. The surface is too reflective and irregular the readings can bounce and or measure just the top surface. It is best to use a probed thermometer or any other submersible thermometer that is of the correct range. They really work best when pointed at brown kraft paper or something the same reflectance.
Taking that into consideration, I have soaked a paper towel or napkin first and point it at that. I should have clarified that I don't read it against the clear tupperware