Review on Diagnostic Manifold Evacuation Refrigerants Adjustable by Evan Calvert

Overall a good set of gauges for the price. Reasons for the 3 Star Rating: 2 things you need to know: First, the valves connecting the quick disconnects are labeled backwards, open means closed and closed means open. You want the quick connect valves to be in the open position when you plug them in, and then close them to actually start measuring pressure, evacuating the system, or adding refrigerant. (Until I realized the valves were bad, I thought the valves were bad). Second, the screw connections are easy to loosen, you need to tighten them gently with pliers to make sure they don't leak.