While using a clinical thermometer, which among the options should be followed?

While using a clinical thermometer:

• The thermometer should be washed before and after use, preferably with an antiseptic solution. 
• Ensure that the mercury level is below 35°C before use. 
• While reading, keep the level of mercury along the line of sight. 
• Handle the thermometer with care. If it hits against some hard object, it can break. 
• Don’t hold the thermometer by the bulb while reading it.