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Plastic box consists a smoke cell, cylindrical condensing lens and a 12 volts LED Bulb.Supplied with a squeeze bottle. For observation of 'Brownian Motion' in smoke particles. Consists of box with plastic lid as well as flanges that allow easy attachment to standard microscopes. The box contains a smoke cell, cylindrical condensing lens and a 12 volts LED Bulb. Apparatus preset to focus the light at correct height. The set is supplied with detailed instructions and a squeeze bottle type smoke generator. Box dimensions: 3.9" x 2.7" x 1"