This video demonstrates the use of two VT3 mini eye tracking devices in the Mangold LogSquare usability testing software. This setup can be used for any kind of eye tracking study. The number of eye tracking devices that can be used synchronously in the Mangold LogSquare or MangoldVision software is practically unlimited. This offers amazing opportunities for studies in drive simulators, flight simulators or similar, and in any kind of usability or user experience tests where the participants should work on multiple monitors.