The New Observer USB is a free version of the Observer software that runs on Windows®. It can be used with the SEI Inspector USB, Digilert200, Monitor 4 USB & Monitor 4EC USB Radiation Detectors. The Observer USB reads in Counts, CPM, and CPS, as well as µR/hr, mR/hr, and µSv/hr and has the ability to collect, log, and perform statistical analysis on the data received. No Mac or WinRT versions available. However, for info about running windows on an Apple computer, please click here