Measuring samples under a defined relative humidity (RH) condition is a very powerful tool to observe the effect of moisture on a sample. Using uniquely designed interfaces and furnaces, a humidity generator can be attached to a TGA, TGA/DSC, TMA or DMA instrument. Using these four upgradable systems, it is possible to measure the properties of materials and the effect of moisture content for real world resting. For example, the material processing conditions can be simulated, shelf life can be determined, or any change in structure properties can be monitored.