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Optical Squares

Double Prism Optical Square
£ 83.64
(95.58 €)
Ensures exact coincidence of the images of the observed targets (normally ranging poles) and allows the instrument to be used for determining right angles to the left and right and for placing points on line.
Ranging Pole Optical Square Holder
£ 5.10
(5.83 €)
Ranging Pole Optical Square Holder.