Industrial laser trackers today typically cover working volumes up to roughly 80 m for portable systems and up to about 160 m in fixed-installation configurations, with sub-millimeter and, on premium units, micrometer-level accuracy classes [S3].
Selection is therefore not a single number but a stack: accuracy vs repeatability, range, environmental compensation, distance-measurement principle (interferometer vs absolute distance measurement, ADM), 6DoF probing, and the software stack that handles relocation and CAD comparison [S2][S3].
Define the Measurement Task Before Reading a Datasheet
A laser tracker decision should start with the part, not the brochure: aircraft wings, shipyard fixtures, and machine tool bores each stress the instrument in a different way, and a tracker that suits one often underperforms on the other [S2].
Document four things up front: largest linear dimension across the part, tightest GD&T tolerance on any feature, whether the work is static inspection or dynamic tracking (e.g. robot calibration), and the line-of-sight conditions (open volume, recessed bores, occluded features). Those four numbers alone will eliminate roughly half the candidate systems on the market, because range, accuracy class, and the need for 6DoF probing each map to one of them [S2][S3].
Accuracy vs Repeatability vs Resolution
Accuracy is the closeness of a measured point to its true value, while repeatability is the spread of repeated measurements of the same point under the same conditions; the two figures are not interchangeable, and a vendor that publishes only one is hiding something [S2].
For work at GD&T tolerances of 0.05 mm or tighter, a tracker with sub-millimeter accuracy, integrated temperature compensation, and a published ADM repeatability figure (typically quoted in micrometres) is the realistic entry point, while relaxed assembly tolerances of 0.1–0.5 mm can be served by a wider range of mid-class units [S3]. Buyers should also confirm the test conditions behind the spec: warm-up time, target type (1.5 in sphere, corner cube, or SMR), and whether the figure is a 2σ or k=2 expanded uncertainty, because those conditions drive the difference between a paper spec and a usable one [S1][S2].
Distance Measurement: Interferometer, ADM, or iADM
Modern laser trackers measure distance using either laser interferometry, Absolute Distance Measurement (ADM), or a hybrid such as FARO's integrated ADM (iADM); the choice changes how the instrument behaves in the field, not just what it costs [S3].
Interferometer systems give the lowest noise on the distance channel but lose the beam each time the line of sight is broken, forcing a re-acquisition routine; ADM systems keep an absolute distance reference, so a beam break does not require resetting to a known home position, which is a major productivity gain on shop floors with frequent occlusion [S1][S3]. Premium platforms such as the FARO Vantage and the Leica Absolute Tracker (ATS600) pair ADM with wireless operation and 6DoF probing, and the ATS600 in particular is documented to support direct, non-contact scanning from long stand-off distances rather than only touched-point inspection [S3].
Working Volume, Relocation, and Multi-Station Networks
Working range, the maximum reach of the laser, is not the same as working volume, the spherical envelope the tracker can serve from a single setup; large parts often require multiple setups stitched together [S2].
For parts longer than a single tracker's reach, the workflow depends on relocation, which means moving the instrument to a new station, re-establishing a known coordinate frame, and continuing the measurement, or on a multi-station network where two or more trackers share targets in real time. The most accurate survey method is to perform relocation between each measurement cycle and to use front-sight/back-sight averaging on every point, which is the standard Insight / CAM2 practice for high-confidence network adjustments [S5]. Buyers who routinely measure objects longer than ~30 m should plan budget and training for this relocation discipline, not just for the tracker head [S5].
Environmental Tolerance and Shop-Floor Reality
Environmental tolerance describes how the tracker holds its spec under temperature swings, vibration, dust, and air turbulence, and it is the spec that most often separates a paper-accurate tracker from a shop-accurate one [S2].
Before delivery, set the tripod on a stable, low-vibration floor and let the head warm up to its operating temperature, because thermal transients in the laser cavity are a primary source of drift on the first hour of a shift; this is why setup time and warm-up are part of the published workflow, not optional steps [S7]. For sites with large diurnal swings, near open doors, or near HVAC diffusers, prefer a unit with documented temperature compensation and a sealed laser head, and budget for a wind / sun shield if measurements are taken outdoors or near large glazed bays [S2][S7].
Software Ecosystem, CAD Comparison, and Training
Hardware selection should never be separated from the software review, because the same point cloud becomes useful or useless depending on the package that processes it; real-time CAD comparison, GD&T reporting, and network adjustment are software features as much as hardware ones [S2][S3].
Modern trackers output thousands of points per second, and that data has to land directly in the CAD or inspection package used downstream; the Leica Absolute Tracker integrates with Hexagon's PC-DMIS and Inspire families, while FARO Vantage systems feed the CAM2 and BuildIT ecosystems, and the new BuildIT 2026 / CAM2 2026 release lines remain the current supported software baseline as of this writing [S3][S5]. Buyers should also confirm that the software supports their existing CAD (CATIA, NX, Creo, SolidWorks), that it handles the relocation workflow natively, and that training for the operator level they actually have, not the level they wish they had, is included in the quote [S2][S5].
Who Should Not Buy a Mainstream Tracker
A shop that only ever measures parts smaller than about 2 m does not need a laser tracker at all, because a fixed coordinate measuring machine or a portable measuring arm will be faster, cheaper, and more accurate on that envelope; reach out to the laser level and laser profiler reference pages if the actual job is 2D alignment or flatness rather than 3D point measurement. [S3]
Likewise, a buyer whose bottleneck is hidden-feature measurement in deep pockets, where a touch probe cannot physically reach, should specify a 6DoF tracker with an active target, not a 3DoF unit, because the productivity gain comes from measuring around corners, not from raw range [S3]. On the other hand, a buyer whose bottleneck is permanent shop-floor alignment of machine tools should compare the laser tracker against dedicated laser displacement sensor and laser marker based alignment systems, because continuous in-process monitoring is a different problem class from periodic 3D inspection. For the same reason, very long concrete floor flatness work is served by a laser screed workflow, not a tracker workflow. A useful cross-check on this distinction is the broader spec-driven approach in Gear Motor vs Motor Grader: Spec-Driven Comparison for Industrial Buyers: right tool, right tolerance band, right volume.
Criteria-Based Comparison of the Main Options
The dominant tracked platforms in 2026 still come from two vendors, and the choice between them is genuinely a workflow choice, not a quality choice, because both publish similar headline accuracy on the distance channel [S3].
On working volume, the FARO Vantage family is documented at ranges up to about 80 m with 6DoF probing and iADM, which is the right pick for portable inspection teams that move between cells; the Leica Absolute Tracker line, including the ATS600, pushes toward larger fixed volumes and adds direct, non-contact scanning at long stand-off, which is the right pick for aerospace and turbine cells where the same station is reused for thousands of hours a year [S3]. On distance technology, both have effectively moved the industry off pure interferometer for portable work in favour of ADM, which removes the beam-break re-homing penalty that used to dominate shop-floor cycle time [S1][S3]. On software, Hexagon's PC-DMIS / Inspire is the deeper metrology stack, while FARO's CAM2 / BuildIT line, including the 2026 releases, is the more open shop-floor package, and the deciding factor is usually which CAD and inspection package the buyer already runs [S3][S5].
Shortlist Logic: From Spec Sheet to a Three-Vendor Bake-Off
Once the four application numbers (largest dimension, tightest tolerance, static vs dynamic, line-of-sight) and the three vendor constraints (range, ADM vs interferometer, 6DoF) are fixed, the practical selection step is a short on-site demonstration: bring two candidate units, a third-party relocatable target nest, and the largest part from the buyer's own production, and measure it under the buyer's own environmental conditions [S2][S5].
The tracker that wins that test is the one that holds its spec on the buyer's floor, with the buyer's operators, on the buyer's part, and on the buyer's software, not the one with the most impressive brochure number; this is also why shortlisting more than three vendors almost never improves the outcome, because the limiting factor at that point is operator skill and workflow fit, not instrument capability [S2][S7]. Track for the next review cycle: ADM-only versus interferometer-plus-ADM product launches, and any update to the 6DoF active-target ecosystem, since both shift the price-to-capability curve for portable 3D inspection within the next product generation [S3].