A mobile optical laboratory has been developed for the study of atmospheric electro-optical phenomena. This system offers significant advantages over previously fielded measurement hardware. The system incorporates 0.9 meter collecting optics; precision, motor-driven, optical support structures; secondary standard, broadband IR sources; visible and IR laser sources; a full duplex FM microwave data link; four transmissometer channels; four radiometer channels; and a high-resolution thermal imager. A modular system design combined with extraordinary mobility make this system a versatile research tool capable of addressing many diverse atmospheric electro-optical problems. A detailed description of the system is presented. The application of the system to the study of battlefield obscurant effects on electro-optical systems is demonstrated with specific examples.