There are several answers to that question on the web, but this is the best one I could find:
http://answers.yahoo.com/question/index?qid=20070906002238AANAcwM
These days, most clinical thermometer (body temperature) measurements are digital, but the glass-and-mercury kind that you have to shake before measuring are still widely used. The shaking is often necessary to keep the mercury from sticking high up in the tube after a previous measurement.
What are a few significant differences between laboratory thermometers and clinical thermometers?
2 answers
Clinical thermometers have a kink but laboratory thermometers have a wide range