A calorimeter in physics is something that measures heat. However, there are mainly two categories of such objects: ones that measure macroscopic amounts of heat, and ones that measure the heat released by subatomic particles when they smash against matter.
Did you recently finish a Master in a scientific discipline, and wish to do some research before deciding whether to embark in a Ph.D.? Do you fancy coming to Padova and work with me and a team of physicists, computer scientists, and astrophysicists on detector optimization?