Professional Optical Square

Description

Also known as a Double Right Angle Prism, the Professional Optical Square is essential for surveyors and site engineers who need to set out 90-degree offsets and right angles with high precision. This instrument is significantly more accurate than a traditional cross-staff and is designed for quick, one-person operation on-site.

The Optical Square uses the principle of double reflection to establish perfect perpendicular lines. It contains two mirrors or prisms fixed at exactly 45° to each other, ensuring that the light ray emerging from the device is at a perfect 90° angle to your baseline. The high-precision Optical Square for professional surveying offers several notable benefits.

Including:

• Accuracy: Delivers a right-angle accuracy of approximately ±1cm at 30m distances.
• Dual Sighting: Features a double-prism system to view right and left 90° angles simultaneously.
• Construction: Robust metal or aluminum housing designed to withstand harsh field conditions.
• Portability: Compact, handheld design with a built-in plumb bob slot for precise centering.
• Includes: Protective carrying case (soft bag or premium wooden box, depending on the model).

Features:

• Professional Accuracy: Rated for high accuracy (within 3 minutes), making it ideal for road surveys, boundary marking, and building layouts.
• Efficient Sighting: The “double prism” design allows you to see the main baseline and the perpendicular offset at the same time, eliminating the need for constant repositioning.
• Durable Build: Many models, like those from Allen Associates or Geo-Fennel, feature a protective metal cover that slides or rotates to protect the lenses when not in use.
• Universal Mounting: While primarily handheld, the hollow shaft often allows it to be mounted on a ranging pole or used with a plumb bob for pinpoint accuracy over a specific station point.

Applications:

• Setting Out: Establish right angles to a chain line for building corners or fence lines.
• Offset Measurements: Take perpendicular measurements from a baseline to objects on-site.
• Placing Points on Line: Easily align ranging rods or stakes over long distances.