A micron gauge is a highly precise instrument used to measure the vacuum level in an HVAC system during the evacuation process. Unlike standard manifold gauges, it measures pressure in microns to ensure that all moisture and non-condensable gases have been removed from the lines. Achieving a vacuum of 500 microns or less is critical for the long-term health of your heat pump systems. If moisture remains in the system, it can mix with refrigerant oil to create acid, which eventually destroys the compressor. We carry various diagnostic parts and tools to help ensure your installation is performed to professional standards. For those pursuing a diy-1 project, using a micron gauge is the best way to guarantee a leak-free and long-lasting system.