A very useful app that could be used to calculate: Reachable diffraction angle for a given detector size and sample to detector distance(note: the "sample to detector distance" was named "Camera length" in the app!), Energy, Bragg d-spacing, wavelength independent q value, Ruby fluorescence/pressure, and do a X-ray Fluorescence lines lookup. Can work offline and help you quickly complete the calculations!! A Good tool for High pressure(HP) experiment!