AC Gauge Set - Function and compatibility: Professional air conditioning diagnostic manifold gauge set designed for R1234YF, R134A, and R404A refrigerants. suitable for AC charging, diagnostic checks, recovery and evacuation work. - 5 ft long charging hose: Three colors for easy recognition - red for high pressure, blue for low pressure, and yellow for refrigerant bottle. Maximum hose pressure is 600 3000psi. - Multifunctional gauges: Gauges rated for a maximum of 550psi (red) and 260psi (blue). Clearly colored dial with Celsius units for easy reading. - Wide application: Ideal for both DIY and professional HVAC maintenance. Allows measuring system pressure, evacuating and refilling coolant, and more. Use scenarios - Automotive service: Use on cars and light trucks with R1234YF, R134A, or R404A refrigerants to read high and low side pressures, diagnose system conditions, and perform charging as part of routine maintenance or repairs. - Residential or commercial HVAC work: Suitable for servicing split, packaged, or rooftop units using the listed refrigerants to measure pressure, evacuate damaged or contaminated coolant, and perform refills as needed. - System recovery and maintenance tasks: Use the manifold to recover refrigerant, evacuate the system, and verify pressures after servicing to ensure proper operation and safety.