Here's how it works:
* Calibration weights are precisely manufactured to have a known mass.
* They are placed on one side of a balance scale.
* The object you want to weigh is placed on the other side of the scale.
* The balance scale will adjust until the two sides are equal.
* The mass of the object is then the same as the mass of the calibration weight.
It's important to note that calibration weights are often sold in sets with different masses, allowing you to accurately measure a wider range of objects.