This instrument is a diagnostic and service tool primarily used in refrigeration and air conditioning systems. It allows technicians to simultaneously measure pressure on both the high and low sides of a system. Equipped with four connection ports, it facilitates tasks like evacuation, charging, and pressure testing without repeatedly disconnecting and reconnecting hoses. For example, when evacuating a system, the device can be connected to a vacuum pump and the system being serviced concurrently.
Its utility is found in its ability to streamline complex procedures, saving time and reducing the potential for refrigerant leaks. This efficiency contributes to cost savings and environmental responsibility. Historically, simpler gauges required more manual manipulation and increased the risk of system contamination. The evolution to multi-port devices represents a significant advancement in HVAC/R service practices, enhancing accuracy and control.