The set features a digital system that makes it easier to read and operate. It comes with R-134a refrigerant, which is commonly used in modern vehicles and HVAC systems. Housing has crack and rubber cover has tear. The manifold set also includes gauges and probes, which makes it a comprehensive tool for diagnosis and maintenance of HVAC & Refrigeration systems. Its usefulness is not limited to just professionals, as it can also be used by DIY enthusiasts.