Document cameras put whatever is on the desk onto the big screen: flexible-arm cameras that show worksheets, textbook pages, demonstrations, and three-dimensional objects live to a classroom display, portable models that travel between rooms, and the higher-end units that capture fine detail for science work and artifact display. They are the overhead projector's successor, without the transparencies.
Choose by how the camera will connect and who drives it: models differ in whether they feed a display directly, a computer over USB, or both, and the direct path matters in rooms where starting a computer is friction. Resolution and optical zoom decide whether small print reads from the back row. For schools standardizing across classrooms, one model everywhere means one set of habits and one spare pool. Lighting attachments and microscope adapters extend the science use. COLAMCO quotes document cameras for education and training rooms across business, government, and education customers.