A refrigerant scale is a precision electronic tool used to weigh the gas as it is added to an HVAC system. This is an essential tool for any EPA 608 Certified technician installing our Multi-Zone Systems. Because Heat Pump Systems are highly sensitive to the amount of gas they hold, "guessing" is not an option. The scale ensures that the exact number of ounces required by the Technical Data is delivered. This guarantees the unit will meet its advertised SEER2 Rating. If you are a pro, you can find these and other tools by visiting our Become a Vendor page. It is a critical piece of equipment for a high-quality, custom installation. Using a scale prevents the compressor damage caused by overcharging.