Answer : The correct option is, Calorimeter
Explanation :
Calorimeter : It is a device that is used to measure the amount of heat involved in a chemical process or physical process.
Barometer : It is a device that is used to measure the air pressure.
Chronometer : It is a device that is used to measure the time.
Odometer : It is a device that is used to measure the distance.
Hence from the given options, the enthalpy of a reaction can be measured using a calorimter.