Product Description :
Consists of a combination of Single & double lens holders on a mounting rotating along the vertical axis. The combination lens holders are adjustable in height and the single & twin Lens holders can either be moved together by rack & pinion or relative to each other by sliding. These motion are read by individual pointers on a mm scale. The which mount can rotate along its vertical axis and the degree of rotation read on a circular scale with 3” steel C.P. stem.