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Among HVAC gauges, a manifold gauge set is a particularly essential piece of testing equipment because it is used in so many ways for a variety of purposes, including vacuuming, testing, and recovery. The basic set consists of two pressure valves: a low pressure valve and a high pressure valve. Some sets have up to 4 valves. Valve readout options include either analog meters or digital displays. Sets vary by brand, inclusions and other considerations. For more on HVAC valves and accessories, see our AC and refrigeration accessories, manifold gauge set accessories thermostatic expansion valves, and refrigeration access valves.