In addition to having all the features of AC-Dual, AC-Dual 20 includes a printer, vacuum leak test functionality, an installed pressure sensor to enhance refrigerant recovery efficiency, the option for a touchscreen, and a bottle scale that enables automatic oil injection.AC-Dual PRO not only includes all the features of AC-Dual 20 but also features a built-in 1234yf identifier. This identifier allows refrigerant identification during recovery and charging, helping to prevent cross-contamination of refrigerants. AC-Dual PRO is installed with 2 filters separately for 134a and 1234yf to completely prevent cross contamination. AC-Dual PRO also includes two set of service hoses with quickly switching connecting 134a and 1234yf vehicles.