The oversized color dial is easy to read, and the instrument is rated for a maximum pressure of 800 psi (red) and 500 psi (blue). The observation window design will help you see the flowing liquid during filling operations. Professional 3 way automotive air conditioning diagnostic manifold gauge set will compatible with R134a /R410A /R22 /R404A refrigerants, perfect for AC freon charging, evacuation, diagnostic check and recovery work. Industrial grade 4 layer hoses can reach 600 psi max working pressure and 3000 psi burst pressure. 1/4" flared fittings provide dependable connections. The angled swivel end is convenient to connect and access. This design is easy to assemble and operate, achieving efficient maintenance/charging work, and is very suitable for home garages or automotive machinery workshops, as well as automotive repair and air conditioning maintenance work. precision pressure gauge, hose, R134a quick adapter, R22 adapter, bottle opener, valve core wrench, calibration screwdriver, etc.