Final answer:
When calibrating a thermometer using the boiling-point method, it should read 100 degrees Celsius or 212 degrees Fahrenheit.
Step-by-step explanation:
The boiling-point method is a common way to calibrate a thermometer. When using this method, the thermometer should be placed in boiling water to calibrate it. At sea level, water boils at 100 degrees Celsius or 212 degrees Fahrenheit. Therefore, the thermometer should read 100 degrees Celsius, or 212 degrees Fahrenheit, when calibrating it using the boiling-point method.