The A/C Pro R134a 1 pc AC Gauge and Hose is a handy tool for checking and recharging your car's air conditioning system. It comes with a gauge that allows you to easily monitor the pressure in the system, ensuring that it's running at optimal levels. The hose connects to the A/C system and allows you to add refrigerant if needed. It's a great tool to have if you want to keep your car's A/C running smoothly during those hot summer months. Stay cool!