The Gemini BET analyser is a simple to use system for measuring the surface area of solid materials. It does this by measuring the difference between the rates of adsorption of analysis gas in the sample and a blank over a range of partial pressures. These measurements are used to automatically calculate the surface area using the Brunauer, Emmet and Teller (BET) method. As well as the Gemini analyser itself, the facility includes a sample preparation station and a 0.1mg balance