The price is negotiable

A two-position instrument that uses a fixed-size image and doubled, adjustable object size to determine the radius of curvature of the reflecting surface

The instrument uses two self-luminous sights (object), the first in the form of a red field and the second in the form of a scaled green pattern, which are represented on a graduated arc track to maintain a constant distance from the eye

Two color filters

Movable base

Graduation in the range of 0-180 degrees

No power supply included