Take a look at this

Wax thermometer, calibrated to 110 C.

How to Use the Wax Thermometer

Use the thermometer to make sure that your candle wax is no hotter than 70 C when using white plastic candle moulds.  Heat the candle wax in a pot on an electric stove.  Remove the pot with the melted wax from the heat before inserting the thermometer.