The compact climate set includes four app-controlled measuring devices for the essential measurement tasks of HVAC technicians: the testo 405i thermo-anemometer, the testo 410i vane anemometer, the testo 605i thermo-hygrometer, and the testo 805i infrared thermometer. When combined with a smartphone or tablet, these devices can measure air and surface temperatures, humidity, air speeds, and volumetric flows in, around, and about air conditioning units and systems. Users can conveniently read their measurements via the testo Smart Probes app installed on their device. In the app, measurement parameters such as humidity or temperature can be easily swapped, deleted, or added with just one click. It is also quick to change the displayed measurement values. Additionally, the app offers application-specific menus for identifying mold risks and automatically calculating the volumetric flow at the outlet or in the duct through simple parameterization of the outlet or duct cross-section. Finally, the measurement data log can be sent directly via email as a PDF or Excel file. The handy testo Smart Case allows for easy transport of the measuring devices, ensuring they are always on hand when needed.