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Looking for audio visual advice? When incorporating the use of audio visual equipment into your class lessons, don't overlook purchasing the small and necessary items that will ensure smoother presentationpresentations on your part. Some supplies to keep on hand include colored transparency markers, transparency film for computer printing, replacement bulbs, batteries, a pointer, and the all important extension cord. It would be unfortunate to let a good lesson go bad, when it's so easy to keep this supply in your closet.