We build two offset jigs now, and the question that comes up most is a fair one: which do I reach for? They look related — same materials, same build, same idea of replacing a guessed offset with fixed geometry — but they solve two different shapes of problem. Here's the simple way to tell them apart in the field.
The Precision Corner Offset reads a corner
The Precision Corner Offset (PCO) is a corner tool. It seats directly on an outside 90° corner and gives you that corner's true position at a known offset. When the corner is square and you can get on it, this is the fast, direct move — one setup, one point, done. Square building corners, square piles, foundation corners, tie-ins that are actually 90° — that's PCO territory.
Its limit is right there in the description: it's built around a square corner. Hand it an odd angle, a line with no corner, or a corner that isn't physically there, and it's the wrong tool.
The Precision Offset reads a line
The Precision Offset (PLO) is a line tool. It takes a fixed 3″ perpendicular offset off any flat face, so you store two points to define a line — and from lines you can build almost anything. One line captures a wall face or slab edge you can't occupy. Two lines crossed give you an intersection at any angle: an inside corner on an odd angle, an outside corner on any angle, or a theoretical corner that isn't there to stand on. It's the more flexible of the two precisely because it doesn't assume a corner at all.
The trade is a step or two more work — you're capturing lines and crossing them rather than seating on one corner — so on a clean square corner the PCO is quicker.
The simple rule
Reach for the PCO when the corner is square and you can seat on it. Reach for the PLO when the angle is odd, the geometry is a line with no corner, or the corner isn't physically there to occupy. One reads a 90° corner directly; the other reads lines and crosses them at any angle. Most crews doing varied work end up carrying both, because between them they cover just about every corner and edge a site can throw at you.
Both come from the same shop and the same principle: the point you actually want is usually a place you can't put a prism, so you work from fixed, known geometry instead of an eyeballed guess.
The takeaway from the dirt
It's not which tool is better — it's which shape you're looking at. Square corner you can get on: Corner Offset. A line, an odd angle, or a corner that isn't there: Line Offset. Match the tool to the geometry and neither one asks you to guess.
The Precision Corner Offset and the Precision Offset are both machined from 6061-T6 aluminum with stainless hardware, on a standard 5/8-11 mini-prism mount, made in the USA. See the specs →