The Brooks GF40 (elastomer seal) and GF80 (metal seal) thermal mass flow controllers and thermal mass flow meters achieve unprecedented performance, reliability and flexibility in many gas flow measurement and control applications. The GF40/GF80 come with the Brooks Instrument multiflow/multirange technology which allows you to change the fluid and flow range of your device in minutes and still maintain its high accuracy. The software is available free of charge and allows OEM’s and Universities to reduce inventory and cost.