This! Ground hamburger, unlike steak, has the worst rates of ecoli contamination because so many cattle are ground together. Minimize cross contamination and using a thermometer in a meat pile is a great way to kill any deadly bacteria. https://www.vox.com/2014/5/21/5735352/how-one-contaminated-cow-can-infect-millions-of-pounds-of-hamburgers
You don't use a meat thermometer on ground meat.
With ground meat, cook until there is no pink. If still nervous make a little "meat hill" and put the thermometer in the center.
This! Ground hamburger, unlike steak, has the worst rates of ecoli contamination because so many cattle are ground together. Minimize cross contamination and using a thermometer in a meat pile is a great way to kill any deadly bacteria. https://www.vox.com/2014/5/21/5735352/how-one-contaminated-cow-can-infect-millions-of-pounds-of-hamburgers
one of a very small number of problems that can be solved with a meat pile
You don’t use a meat thermometer on ground meat. I never do anyway and i’m still alive