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.
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