HVAC technicians juggle a PT chart booklet, 2-3 separate reference apps, and handwritten reports on every service call. RefriPro puts all of it in one offline Android app. - PT chart calculator for 50+ refrigerants - Superheat/subcooling calculator with 6-state diagnosis — not just a number, but what it means - 754 error codes across 8 major brands (Carrier, Daikin, Trane, Lennox, Mitsubishi, LG, Fujitsu, Samsung) Everything runs locally. No internet required. Free on Google Play.