3M 9100 Overhead Projector
The 3M 9100 overhead projector is easily portable and ready to go once  you remove it from the box--there is nothing to be assembled. The post assembly  that holds the projection head aloft is hinged against the body of the unit, and  a loosening turn of a knob swings it into place.The body is well designed and made of a sufficiently durable grade and weight of  plastic to make this model a good choice for heavy usage. Simple to use, one  switch turns the projector on and off, and a separate control panel allows you  to change the lamp to high or low intensity. The lamp bulb is easily changed,  and the power cord can be neatly wrapped around twin brackets at the bottom  front.Once the post with the projection head at its top is retracted and secured, a  carrying handle on one side of the body affords sound and stable portability.  The instruction manual (divided into English, French, and Spanish sections) is  simple and straightforward. It is primarily useful for its easy troubleshooting  should any problems arise, such things as a faulty bulb or projecting onto a  screen that is not perpendicular to the projected image. This 3M model is ideal  for classrooms, business meetings, and large presentations of any sort.