HVAC Check & Charge™Need a straightforward, on-the-job refrigerant charge calculator? From Emerson Climate Technologies, HVAC Check & Charge™ is a free and convenient mobile HVAC charging app that allows you to quickly calculate the right system refrigerant charge. HVAC Check & Charge can be used for the following refrigerants: R-22, R-410A, R-32, R-407C, R-134a, R-452B, R-454B, R-438. Choose from the subcooling, superheat, or airflow calculators and enter the system temperature—plus the sensible load and latent load. Based on this information, the HVAC app determines the proper system charge and whether you need to make any other alterations based on the conditions. This HVAC service app also offers imperial and metric support.
https://apps.apple.com/us/app/hvac-check-charge/id574809181