Question

A clinical thermometer is a is not used to measure high temperature and why

Answer 1

A clinical thermometer cannot be used to measure high temperature because it is designed to only measure temperatures a handful of degrees either side of normal body temperature (98-99F). 

If you heated the liquid in the thermometer much over 105-110F it would expand to the top of the capillary tube, finally bursting its way through and breaking the glass.

Answer 2

Answer-

A clinical thermometer cannot be used to measure high temperatures because it has been designed to measure only human body temperature which varies over a short range.