The temperature can be calibrated in the device by using several samples that have a known accurate melting point or a curie point for magnetic materials such as iron or nickel and are known to be accurate. The magnetic material is placed in a sample crucible and a magnetic field is applied to it. And the reference material (a piece of iron, for example) is heated until it reaches the Curie point, at which the iron becomes magnetic parallel, working on the equation of the weight change resulting from the external magnetic field.