Here is a simple way to reset your thermometer when you need to use the boiling water technique though we have several methods out there. Boil a pot of distilled water, the use of distilled water is essential as it eliminates any impurities that lower the boiling point of water. Once the water starts to boil, leave it for 30 seconds then insert your thermometer. However, ensure the thermostat does not touch the surface of your pot either bottom or sideways. The temperature should be 100°C, record the difference, and adjust the contrast.