Solution-
One should follow these steps to measure his/her body temperature using a clinical thermometer:
Step I- Wash the thermometer properly with an antiseptic solution and if in case, antiseptic solution is not available, then wash it with clean water.
Step II- Hold it definitely and give a few jerks which will bring the level of mercury down below 35°C.
Step III- Place the bulb of the thermometer under the tongue.
Step IV- Wait for one minute, take the thermometer out and note the reading keeping the level of mercury along the line of sight.
This reading gives the exact body temperature.
It is necessary to state the temperature with its unit denoted by °C.
It should be handled with care as on hitting against some hard object it can break.