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This replaces the regular scope and provides a 2X power artificial horizon for use on land, or at sea if extremely calm conditions exist and the natural horizon is not visible. The bubble is centered in the reticle (as shown). The eyepiece can be focussed by turning it. Batteries in the sextant handle supply electricity for night lighting, which is adjusted with a dimming rheostat for use with faint stars. This item can only be used with Cassens & Plath or Astra III Professional sextants. It should be ordered from their respective optional items lists since the electrical cords are different. If it is desired to use this on some other type of sextant, the user would have to fashion a battery pack to supply the electricity.
