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Optical Squares

Double Prism Optical Square
£ 110.00
(130.18 €)
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
£ 6.17
(7.30 €)
Adaptor for mounting the Double Prism Optical Square onto ranging poles.
detail ranging range survey surveyor surveyors pole rod stick mount adapter adaptor