Agreed! This is very effective and very useful thing. Which helps any common people to identify health issue like cold, fever. Though there are different types of thermometer also there is different ways to use this medical tool. This is very helpful to determine if someone is suffering from a fever. Some women use thermometers to determine ovulation by recording changes in body temperature. Formerly, glass thermometers were commonplace in both homes and doctor's offices. Digital thermometers are used orally, rectally and under the arm. The thread of the thermometer is quite fragile, and when it breaks it is nearly impossible to rejoin. Mercury thermometers tend to be much more durable under duress.