A primary goal of WiscSIMS is to provide experienced and inexperienced SIMS users with the best possible analytical precision and accuracy for in situ analysis of stable isotope ratios at the scale of 1 to 10 micrometers. We can also provide advice and assistance on a range of related scientific and technical issues. The unique ion microprobe capabilities permit analyses in thin section or polished mount to be correlated with textures and information from optics, imaging, or other forms of instrumental analysis. In combination, such data can provide fundamental new levels of understanding for samples of Geological, Planetary, or Biological interest. The advantages are especially great for samples that are zoned, precious, or very small, which can’t be analyzed by other means.