This AC gauge set works with 4-types of refrigerants, perfect for servicing automotive HVAC, household air conditioners, and refrigerators, and supports convenient DIY maintenance at home. It comes with three 5 ft. reinforced PVC Freon hoses that handle 600 psi working pressure and 3000 psi burst pressure, and anti-slip sealing gaskets at the interfaces prevent leakage and loosening during use.The gauges feature a dry-liquid hybrid design with a dry dial for better winter performance, ±1.6% accuracy ensured by calibration screws, and easy-to-read Fahrenheit units. The built-in sight glass allows you to monitor the flowing refrigerant while filling. Made of solid brass, aluminum, PVC, and plastic, the heavy-duty set is sturdy, leak-proof, and designed for long-term use.