Optical square
No. 00420020
An optical square is used to set out a right abgle, to place a point on a line or to place a point on a line between two points and at right angle to a third point.
Very useful for excavation survey! With only two persons and four stakes you can set out your square meter system in a record time and with high accuracy!
Two prisms of 15 mm mounted above and below the "through" sighting windows. With leatherbag.
Number of pieces : 1. Weight : 80 g. Technical details : height of the prism : 15 mm ; accuracy : 1’-2’. Reminder of the accuracy : 1’ : 0,2 cm at 10 m or1,3 cm at 50 m, 2’ : 0,6 cm at 10 m or 2,6 cm at 50 m, 3’ :0,9 cm at 10 m or 3,9 cm at 50 m.
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