The cards of these compasses are immersed in a special dampening fluid that ensures vibrationless, smooth movement. They are pivoted on polished sapphire tips. The veering assembly is to all intents and purposes subject to no wear and the liquid remains clear and its viscosity low under all conditions.
The compasses have been given permanent anti-static treatment. The lens aperture of the KB-14 is restricted horizontally by a column, which automatically centers the eye on the optical axis, thus eliminating parallax. The model sold here, KB-14/360 R includes a reverse scale on the sighting rim.