The time required for a heat probe varies somewhat depending on its type and the part of the body where the temperature is measured. In general, electronic heat detectors take a few seconds to about a minute and are usually placed on the forehead or wrist of the person being tested to check the body temperature. Mercury heat detectors vary in measurement time due to differences in the measurement site. When measuring the oral temperature, should be carried out in a resting state, such as just done exercise, drinking or eating, etc., are not suitable for measurement, generally 3 minutes after the removal of the reading can be. When measuring the axillary temperature, the first need to wipe the axillary sweat, put the mercury end of the heat probe deep in the armpit and not exposed, the thermometer in the center of the armpit, with the arm clamped, usually 5-10 minutes after the removal of the reading. When measuring rectal temperature, you need to choose the anal thermometer, first in the mercury end of the thermometer coated with petroleum jelly or other lubricants (vegetable oil, soap, etc.), and then gently inserted into the anus 3-4 cm, about 3-5 minutes after removal, wipe clean and read the number can be. Mercury probe heat needle after use to pay attention to put in good time to avoid the outflow of mercury after the rupture of the human body caused harm.