The EQSphere was originally developed by Smithsonian scientists to study acidification in coastal ocean and estuarine waters. EQSphere’s rugged design permits long term remote monitoring of carbonate chemistry, even in extreme conditions where traditional gas-liquid equilibrators prove unreliable due to biofouling, clogging, and freezing. The simplicity of EQSphere’s design allows turbid/debris-ridden water to flow freely with full functionality, making it the ideal instrument/sensor accessory to capture real time and long-term measurements of volatile compound and trace gases (CO2, methane, radon, H2S, NOx, trihalomethanes, etc.) in aqueous environments and industrial settings.