The ANTECH CP264-0420 High Sensitivity Large Sample Calorimeter is applicable to a wide range of plutonium measurement requirements including international safeguards measurements, shipper-reciever distance measurements, in-plant accountancy measurements and anomaly resolution in passive neutron coincidence counting or segmented gamma ray scanning. The instrument also has a role in replacing a portion of destructive assay. The CP264-0420 is transportable without compromising measurement accuracy. It can be moved to a measurement site so that it is not necessary to move Special Nuclear Material (SNM).