As basic information for the design of technical adsorption processes at least the adsorption equilibria data of all pure components need to be known. These information are usually given as adsorption isotherms, i.e. the adsorption equilibrium is given as a function of the gas phase pressure or the concentration of the adsorbed component in a carrier gas at constant temperature. Adsorption equilibria data are mostly measured isothermal by changing the properties pressure or concentration. This article reviews the most commonly used techniques for the measuring of adsorption equilibria and the pros and cons for each method are discussed and compared. The second part focuses on gravimetric measurements of adsorption equilibria using magnetic suspension balances. This type of equipment allows the measuring of adsorption data over a large pressure- and temperature-range and thus covers the relevant range for engineering technology purposes.