ZEISS Demo Products ZEISS demo products have been slightly used for display or demonstrations by ZEISS during outdoor industry events. They may exhibit minor cosmetic imperfections that will vary from demo product to product. ZEISS demo products and their included accessories are guaranteed by ZEISS to operate to the standards for a new product. All ZEISS demo products are covered by the transferable ZEISS Limited Lifetime Warranty (View Warranty). For sporting events, in the theatre or in the great outdoors, the Monos are the masters of versatility, fitting snugly in a jacket pocket or handbag. Depending on the model, they are ideal for use as magnifying glasses or even for binocular amplification. They can turn your binoculars into a spotting scope by tripling the magnification. Even the smallest details can be seen: nothing escapes their notice. Whether you are watching dragonflies in the reeds or birds at a great distance, the Monos are an often undervalued but extremely useful aid to nature observation.