For clinical.
1. Wash the thermometer before and after every use with an antiseptic lotion and handle it with care
2. See that the mercury levels are below 35 degrees and do not hold the thermometer near its bulb while reading the temperature.
3. While noting down the temperature from the thermometer, place the mercury level along the line of eye sight.
4. Do not place the thermometer near a hot flame and also do not expose it to the direct sun light.
For laboratory.
(i) The thermometer should be kept upright not tilted.
(ii) Bulb should be surrounded from all sides by the substance of which the temperature is to be measured.
(iii) The bulb should not touch the surface of the container.