Linkam Scientific Instruments has launched the updated RHGen Relative Humidity (RH) Controller which offers humidity control between 3 % and 95 % RH, at temperatures from ambient to 85 °C, with an upgraded RH sensor and improved connectors, providing environmental control to a variety of Linkam temperature control stages and third-party chambers. The device can be used in conjunction with light microscopy, Raman, FT-IR and X-ray to provide further sample characterisation. The RHGen allows the user to precisely control the humidity around a sample, without the need for an external dry air supply. The device can also be combined with the Inert Gas Regulator, which acts as a regulated pressure interface between the RHGen and an external gas supply to allow inert gases into the chamber, to replicate unique environmental conditions.