Usually there is a sense of huge relief 
While that is often the case, the scientifically correct methodology is to measure with a digital probe.
In days of old, when knights were bold and popsicle sticks weren’t handy. They wouldn’t linger, they’d use their finger and eat the rest like candy. :willy:
And how do you determine that, visually or by touch? 
Do you have a dunny cam? 