Geo Fennel Optical Square F1M
Geo Fennel Optical Square F1M. The double pentagonal prism offers an Accuracy of <1'. Large clear prisms accurately turn line of sight exactly 90°. Prisms are silvered top and bottom for viewing +/- 45° above or below the position of the operator. Look through located between prisms for best accuracy. Smoothly operating rotating closure protects prisms.
The Geo Optical Square F1M offers the highest accuracy.
Double penta prisms for right angle sighting in either direction. Protective metal cover slides around to protect prisms.
Placing points on line, Setting out curves, Offset measurements, Determining the horizontal, Detail plans and area measurement, Simple height measurements. The Ideal Builders Square. Sturdy carry pouch included.
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