the tools and components used in refrigerant charging and maintenance of a refrigeration or air conditioning system. The top section shows a technician using a manifold gauge set to measure the pressure in the system, with two pressure gauges: one for high pressure (red) and one for low pressure (blue). The lower section displays a schematic of the refrigeration cycle, with key components labeled, such as the evaporator, condenser, filter drier, and compressor. It also shows the refrigerant lines in blue and red, the use of quick couplers for secure connections, and a cylinder for refrigerant storage, marked as having no dip tube. The diagram further highlights the flow of refrigerant (R-134A) through the system, including its expansion, compression, and cooling processes. This setup is essential for ensuring efficient operation and maintenance of cooling systems.