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In this work we discuss the measurement protocols for indirect determinationof the isothermal entropy change associated with first order phase transitionsin caloric materials. The magneto- structural phase transitions giving rise togiant magnetocaloric effects in Cu-doped MnAs and FeRh are used as case studiesto exemplify how badly designed protocols may affect isothermal measure- mentsand lead to incorrect entropy change estimations. Isothermal measurementprotocols which allow correct assessment of the entropy change around firstorder phase transitions in both direct and inverse cases are presented.

On entropy change measurements around first order phase transitions in caloric materials