How do you test the heat level of a thermal straightener?

The method of placing a piece of misted tissue between the plates of a thermal straightener is an effective way to test its heat level because this technique provides a visual indication of the heat emitted by the plates. When the misted tissue is placed between the hot plates, the moisture will evaporate quickly, allowing the stylist to gauge the temperature based on how rapidly the tissue dries out. This method helps ensure that the straightener is at an appropriate temperature for styling hair without risking damage or burns.

Using a thermometer directly on the plates can be impractical because it can be challenging to place the thermometer safely and accurately on the heated surface, and readings may not be reliable. Touching the plates to your wrist is unsafe; while trying to feel the heat level, there's a significant risk of burns. Soaking a cotton ball in water and pressing it against the plates also won't provide a precise measurement of temperature, as the water may evaporate quickly, but not in a manner that reflects the actual heat level in a controlled way. Hence, using misted tissue is the most efficient and safest method.