This App is used to instantly and accurately display numerous measurements, including pressure, temperature, etc., for the Si-RM3, Si-RM13, Si-RV3, and Si-RM1. It comes with long-range low-energy Bluetooth® 4.2 up to 30 meters (98 ft) and the ability to store and update approximately 120 refrigerants, including environmentally-friendly low global warming potential (GWP) and natural refrigerants.