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Demoslides are the fastest, easiest way to study an amazing variety of microlife. Demoslides are 5 1/4" culture tubes, filled with Connecticut Valley Biological's healthy, living microorganisms. Designed with a thin, flat observation chamber at one end, they double as a microscope slide. You don't even have to open a Demoslide; just pop it under the microscope and you're ready to go. Use them over and over -- cultures last for days.