Lens clock (radian apparatus, radian clock) is a precision measuring tool. Specially designed for accurate measurements of lenses. It is placed on the concave or convex side of the spectacle lens. With the ability to determine the curvature of the lens with a refractive index of 1.53. Made of stainless steel.
A cover will protect measuring points from being destroyed.
Material: Stainless steel
Size: 88 x 75 x 35 mm