Ruler skeascopic LS-02

The LS-02 skeascopic ruler is designed for objective examination of the eye with the help of skeascope by the shadow test method. Set LS-02: Ruler with positive lenses and movable frame 1 pc; Ruler with negative lenses and movable frame -1 pc. Range of posterior vertex refraction reproducible by rulers 19dptr. Gradations of reproduction of posterior vertex refraction, in the range from 0 to 9,5dptr. through 0,5dptr.; over 10,0dptr. -1.0dptr. Length of rulers not more than 400 mm. Width of rulers not more than 40 mm. Rulers thickness not more than 15 mm. Overall dimensions in the case, not more than 425x45x60mm. Weight in the case, no more than 850 gr.