Direct-contact styluses still dominate the high-precision contour-and-roughness segment: the SJ5760 from Chotest is a 2-axis CNC direct-contact contour measuring machine that evaluates radius, angle, distance, coordinates, straightness, and roundness, with SPC statistics and CAD/PDF profile import [S1].
Across the same Directindustry category the supply base is 22 manufacturers and 82 products, with Jenoptik (Waveline W600/W800/W900), Taylor Hobson (Formtracer), and Chotest (SJ5760, VX8100, VX8200, VX8300) the most-listed contour and roughness lines [S2]. Selection, however, is driven by what you actually have to measure, not by the brand sheet.
Direct-contact stylus vs video vs flash: pick the probe first
The first hard fork is contact versus non-contact. Direct-contact systems trace the contour with a mechanical stylus and a 2-axis drive: the SJ5760 covers diameter, geometry, contour, shape, coordinate, angle, roundness, straightness, and distance, and supports part/shaft/tool/bearing inspection on production lines and calibration benches [S1].
Video contour machines replace the stylus with a camera and image-based edge detection, which is the route Chotest takes on the CHT322A for automatic geometry, angle, and position inspection on parts, electronics, and medical components [S10]. Flash measuring machines sit at the far end of non-contact: the VX8100 lists a 20M CMOS sensor, field of view up to 200 mm × 100 mm, depth of field 3–30 mm, working distance 120 mm, and accuracy of ±2 µm (single field) to ±5 µm (without stitching) [S2].
For a 0.5–2 mm radius on a hardened tool edge, the direct-contact stylus wins on edge definition. For a soft polymer gasket, video or flash is the only realistic answer, because stylus load will deform the feature. For a 0.1–0.5 mm pitch connector pin, the Chotest connector application case specifies flash measurement of length, width, and pin spacing on a one-key button cycle [S8].
2-axis profile vs 3D flash vs roundness/cylindricity
Once the probe type is fixed, the second decision is the geometric scope. A 1D profile (radius, angle, distance, step) fits a contour measuring machine in the SJ5760 / Formtracer class and runs in minutes per feature [S1][S2]. A 2D-in-3D measurement (length, width, spacing across a connector or a stamped sheet) needs a flash system with multi-field stitching: the VX8100 family handles fields of view W130 mm × L20 mm and W200 mm × L100 mm at ±2 µm to ±5 µm without stitching [S2].
Roundness, cylindricity, and straightness are a separate branch: the Taylor Hobson Talyrond 500 HS PRO is a high-speed roundness and straightness instrument, while the Talyrond 595H PRO covers ultra-high-precision roundness, cylindricity, and straightness with precision-engineered axes [S2][S3]. These are not interchangeable with a profile-only contour machine, and they are usually specified in bearing, shaft, and large-diameter component work.
For high-precision straightness alone, Directindustry lists 11 manufacturers and 21 products, with Taylor Hobson, TZTEK, ZEISS Industrial Metrology, and Chotest the most active [S6]. For a buyer, that means three budgets: stylus profilometer (entry–mid), flash optical profiler (mid), roundness/cylindricity bench (mid–high), with the roundness bench rarely substituting for the other two.
Measured-value menu: at least 9 outputs, but the spec sheet rules
The SJ5760 data sheet lists the measured physical values as diameter, geometry, contour, shape, coordinate, angle, roundness, straightness, distance, and dimensional, with operating modes automatic and CNC and 2-axis drive [S1]. The CHT322A narrows that menu to contour, geometry, angle, and position, with video technology and automatic mode for parts, electronics, and medical parts [S10].
For a buyer, three rules follow. First, the reported value list must include every parameter the print calls out, because adding a capability later usually means a different machine class. Second, CNC automatic mode plus SPC statistics is the minimum for production-line use, and the SJ5760 supports both with database query by object type, manufacturer, manufacturing number, inspector, and inspection date [S1]. Third, software that imports CAD and PDF profiles (as on the SJ5760) and exports to Word, Excel, and AutoCAD removes a manual drawing step that otherwise eats operator time [S1].
Throughput, automation, and the production-line fit
On a production line, a contour measuring machine is judged by three numbers: cycle time per feature, automatic-mode coverage, and report turnaround. CNC automatic mode plus multi-feature program execution is the default on the SJ5760, which advertises fully automatic measurement programs and a single database for records, certificates, and batch printing [S1].
Flash machines change the throughput math because the cycle is image-based. The VX8000 series with double-telecentric optics and high depth of field targets one-key, fast dimensional measurement, while the VX3200D and VX3000 series extend the same one-key cycle to larger field-of-view layouts [S2][S4]. For 100% inline connector inspection, the flash architecture is the realistic option, with a documented Chotest connector case showing length, width, and pin-spacing capture in a single cycle [S8].
Continuous online systems (43 manufacturers, 78 products on Directindustry) are a different category: laser triangulation and X-ray basis-weight systems monitor coating thickness, eccentricity, capacitance, and snow load in real time, and they do not substitute for a benchtop contour machine [S4].
Who should not pick a stylus contour machine
Three jobs do not belong on a direct-contact profilometer. Soft elastomer or polymer gaskets deform under stylus load, so a flash or video system is the correct tool. Sub-50 µm features on microelectronics, where the stylus tip radius and contact force distort the reading, are likewise non-contact territory, which is why the CHT322A video series and the VX8100 flash family are positioned for electronics and connector work [S10][S2][S8].
Full 3D freeform surfaces, for example turbine blade or additively manufactured part inspection, need a 3D optical or CT system: the ZEISS O-DETECT, ATOS ScanBox 6 / 8, and Hexagon Optiv Reference cover that duty, and a 2-axis profile machine cannot replace them [S3]. If the print calls out cylindricity on a 500 mm bearing, a Talyrond-class bench is the right answer, and a benchtop profilometer is not [S2][S3].
For shop-floor metrology on cylindrical parts in the same product family, a vision measuring machine or a contour measuring machine is the conventional pick, and the caliper vs micrometer decision sits one level below for hand-tool dimensional checks. For 3D freeform parts, the CMM selection criteria map is the correct next read.
Comparison of the four realistic options
Side by side, the four common contour-measuring classes line up against four selection criteria. Direct-contact stylus profilometers (SJ5760, Formtracer) score high on edge definition and standard conformance, mid on throughput, mid on 3D capability, and high on shop-floor robustness [S1][S2]. Video contour machines (CHT322A) score mid on edge definition, mid on throughput, low on 3D, and high on soft-part and electronics suitability [S10]. Flash measuring machines (VX8100, VX8200, VX8300, VX3200D) score mid on edge definition, high on throughput, mid on 3D via stitching, and high on connector/stampings [S2][S4][S8]. Roundness / cylindricity benches (Talyrond 500 HS PRO, Talyrond 595H PRO) score high on form error, low on freeform profile, low on 3D, and high on bearing/shaft work [S2][S3].
A useful shortlist logic: start from the print, not the catalogue. List every geometric callout (radius, angle, distance, straightness, roundness, cylindricity, pin spacing), mark each as 2D profile or 3D, mark the material (hardened tool, soft polymer, electronics, bearing steel), and only then map the four classes against the list. Directindustry's 22-manufacturer, 82-product contour category plus the 11 straightness manufacturers and the wider 80-manufacturer, 259-product high-precision list give the supply side; the four-class map gives the demand side [S2][S6][S3].
Standards, calibration, and what the spec sheet must show
For a high-precision contour measurement result to be defensible, the instrument must be backed by traceable calibration and a measurement uncertainty statement. The SJ5760 supports user-defined reports, batch certificate printing, and database query by inspector, equipment number, and inspection or effective date, which is the minimum paperwork to keep a contour machine audit-ready [S1]. Flash machines like the VX8100 publish the calibration-relevant numbers directly: ±2 µm (single field) and ±5 µm (without stitching) at working distance 120 mm [S2].
For buyers comparing two machines on paper, the hard checklist is: probe type and tip radius; axis count and drive type (1D, 2-axis CNC, 3D flash); measured-value list mapped 1:1 to the print; software interfaces (CAD import, PDF import, SPC, Word/Excel/AutoCAD export); and documented accuracy with units over the working distance, not a generic "high precision" claim. The SJ5760 catalog and product page carry most of this; the CHT322A, VX8100, and Waveline W600/W800/W900 datasheets complete the cross-check [S1][S10][S2].
The 2026 supply side on Directindustry shows continuous expansion: 92 manufacturers and 237 products for industrial measuring systems as of 2026-07, 19 manufacturers and 31 products for smart measuring systems, and 80 manufacturers and 259 products for high-precision systems as of 2025-02 [S5][S7][S3]. Pricing for comparable optical benches is tracked in the vision measuring machine price 2026 reference, which is the natural cross-read when a contour decision edges into a vision-measuring decision. Track next: any new ISO 10360-style uncertainty statement on flash-measuring machines, and the next Directindustry refresh of the contour-measuring-system category beyond the 82-product baseline [S2].
Component reference pages worth checking: coding machine.