Differential pressure measuring device testo 312-4, hose set for testo 312-4, pump with valve, conical test connection 1/2″, conical test connection 3/4″, infrared printer for creating a protocol, pressure set for measuring gas pressure in heating systems, high pressure connectors 3/8″ and 3/4″, high pressure connectors 1/2″ and 1″, high pressure probe 1 to 25 bar, system case