Precision Offset (PLO) — 3″ Perpendicular Line Offset Jig for Land Surveying

Locate any line that needs surveying — walls, edge of slab, footings, any flat face — from a fixed, repeatable 3″ perpendicular offset.

When a crew can't get a clean shot on a wall or slab edge, the Precision Offset gives them an accurate, repeatable position a known 3″ off the face. Store two points along the line and you have the line itself; cross it with a second line and you have the intersection — an inside corner on an odd angle or an outside corner on any angle, it backs out cleanly either way. It's the line-and-edge companion to the Precision Corner Offset (PCO), built by Dan Shields from the same field-proven method.

Seat the flat reference face against any flat surface, mount your mini-prism on the ribbed grab handle, and store the point. Because the 3″ offset is a known, machined geometry perpendicular to the face, the true line position pulls in cleanly — every time, across every crew.

Why crews use it

• Defines any surveyed line — walls, slab edges, footings, any flat face — from two repeatable points off a known offset.
• Cross two lines to create an intersection: inside corners on odd angles, outside corners on any angle.
• Fixed 3″ perpendicular offset to clear the face and keep the geometry known.
• High-strength ASA frame and ribbed grab handle; 6061-T6 aluminum reference plates that hold their geometry in the field.
• Your standard mini-prism mounts right on top — 5/8-11 thread, no proprietary target required.
• Engineered and manufactured in the USA, engineer-direct.

Specifications

• Frame & grab handle: high-strength ASA plastic
• Reference plates: 6061-T6 aluminum
• Fasteners: 18-8 stainless steel
• Offset: 3″ perpendicular to the reference face
• Prism mount: 5/8-11 thread

Made in the USA of American materials. Approx. 2-week lead time. Free shipping.

Prism not included.