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Scott Lancer introduces the HVAC Check-In Charge smartphone app, developed by Emerson Climate Technologies to assist technicians with charging dry-charged air conditioning units. This app, based on the traditional cardboard slider calculation, is intended for use with new AC systems rather than troubleshooting existing ones. After downloading the app, users can launch it by tapping the icon. The initial screen presents a refrigerant selection menu with options for R22 and R410A. After selecting the appropriate refrigerant, users can access three calculation options: acquired superheat for non-TXV systems, required subcooling for systems, and additional functionalities related to refrigerant charging.