The Pittsburgh A/C Manifold Gauge Set available at Harbor Freight is intended exclusively for the testing, flushing, and filling of an R134a air conditioning system. R134a is a type of refrigerant used primarily in automotive air conditioning systems, and it requires a particular kind of setup to check and manage.
The Gauge Set is made up of a variety of color-coded valves and hoses to ensure proper installation into the air conditioning system alongside vacuum pumps and refrigerant cans when necessary. When hooked up, the Gauge Set measures the high side and low side pressure readings via a pair of gauges. Depending on the ambient temperature outside a vehicle, the ideal high and low pressure levels will vary, information that these gauges can provide you with.
The red high side gauge can measure PSI levels from 0 to 500, while the blue low side gauge measures from 0 to 120 PSI. These gauges come with high-pressure safety valves to ensure no refrigerant leaks occur, as well as a sight glass for checking the condition of the refrigerant yourself.
The Gauge Set costs $64.99 at Harbor Freight, and comes bundled in a pocketed carrying case. It also includes a metal hook to hang the gauges from the hood of your car while working.
